ASP NET strange compilation error

Question

I don t know what s wrong with my machine  but it s a while that I m getting the following strange error from ASP NET  for all my applications    Compilation Error  Description  An error occurred during the compilation of a resource required to service this request  Please review the following specific error details and modify your source code appropriately    Compiler Error Message  The compiler failed with error code -1073741502    Show Detailed Compiler Output    C  Windows SysWOW64 inetsrv gt   C  Windows Microsoft NET Framework v4 0 30319 csc exe   t library  utf8output  R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root 75855fbd 1e953b27 assembly dl3 2689d6b5 f0791420 961fcc01 wnvhtmlconvert dll   R  C  Windows Microsoft Net assembly GAC MSIL System v4 0 4 0 0 0  b77a5c561934e089 System dll   R  C  Windows Microsoft Net assembly GAC MSIL System Drawing v4 0 4 0 0 0  b03f5f7f11d50a3a System Drawing dll   R  C  Windows Microsoft Net assembly GAC 32 System Web v4 0 4 0 0 0  b03f5f7f11d50a3a System Web dll   R  C  Windows Microsoft Net assembly GAC MSIL System Web Entity v4 0 4 0 0 0  b77a5c561934e089 System Web Entity dll   R  C  Windows Microsoft Net assembly GAC MSIL System ServiceModel Web v4 0 4 0 0 0  31bf3856ad364e35 System ServiceModel Web dll   R  C  Windows Microsoft Net assembly GAC MSIL System IdentityModel v4 0 4 0 0 0  b77a5c561934e089 System IdentityModel dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root 75855fbd 1e953b27 assembly dl3 d08c81cd 4d77c01f 961fcc01 AjaxControlToolkit dll   R  C  Windows Microsoft Net assembly GAC MSIL System ServiceModel Activation v4 0 4 0 0 0  31bf3856ad364e35 System ServiceModel Activation dll   R  C  Windows Microsoft Net assembly GAC MSIL System Web ApplicationServices v4 0 4 0 0 0  31bf3856ad364e35 System Web ApplicationServices dll        AND SO ON        Facts    Killing worker process fixes the problem temporarily I even reinstalled my  NET framework  It didn t work  Restarting IIS doesn t help   What can cause this problem

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I had this error message and for me the solution was to install Dot Net Framework 4 6  While my project targeted 4 5 2

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I got the same error  came out of nowhere  After several hours of trying all the solutions mentioned here and on other forums  what worked for me was simple  Clean Solution  and  Rebuild  in VS2015

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OK  after days struggling with this issue  I finally fixed it    Not by clearing ASP NET temp Not by reinstalling the  NET framework    Simple    I changed the application pool identity from  Local system  to  ApplicationPoolIdentity    Apparently there was a permission error with my local system that the C  compiler  csc exe  could not access some resources and source codes   In order to change your AppPool identity follow steps given here  http   learn iis net page aspx 624 application-pool-identities

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I had to kill multiple instances of MSBuild exe hanging in process explorer   Then the website runs OK

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If you get the error  An error occurred during the compilation of a resource required to service this request  Compiler Error Message  The compiler failed with error code 255    Try to terminate the processes  VBCSCompiler exe   VBCSCompiler exe can also be the problem if your application can not build due to the fact that some packages can not be transferred to the bin folder

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If you are still struggling to solve this issue  even after all options  then try to find application which is running and taking huge memory   In my case it was an application which was having more than 100 instances running due to some error and that was taking at least 20 MB per application so around 2 GB   After I killed the few applications and memory was released my site was back online

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Cause  I have noticed that when I clean my project or clean one of the dependent projects and then hit refresh a few times on the page showing the site then it causes this error  It seems like it tries to load run a broken missing DLL project somehow   Rename the project   s IIS directory to something different and with new name it loads fine  again providing project is built first OK then run otherwise it causes the same issue

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The answers provided are not the solution  The  NET 6  stuff is pretty different from what we used to  A lot has changed  from having to deal with portable libraries to Visual Studio 2015 installing an old compiler  it cost me four hours cracking my head    The long story short  Stack Overflow question How do I use C  6 with a Web Site project type   You need to install the C   NET compiler  now runs as a service bla bla bla   and you need to run updates on NuGet to get the latest everything  before trying anything else    The compiler must be installed on the project your solution runs from  so your website or your main project your application starts from  if you have multiple projects     Once you install that then sort out your web config referencing any portable libraries  and delete both the bin and obj folder  to avoid works on my computer nightmare   It should just run  But be patient  what happens on your machine may vary as much as the answers above  Most of the answers above hide other problems  It may work for a while  then boom  compiler error  I had a few pages working  then some pages started failing because of some packages that have started using portable libraries

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This kind of errors appears  strange  because they are related to the  NET Framework dynamic source code generation and compilation feature  and  in my opinion  the various errors generated are not reported with all the information needed to understand the real root cause  IIS will report only a generic failure like  Configuration Error  or  Compilation Error   the command line of the dynamic compilation  with reference to temporary files created on-the-fly   and an error code   Since the error is generic  by searching it on Internet  and in answers to this question   you ll find several different solutions that solved the issue for other people  but will not necessarily solve the issue for your specific case   For the specific error reported in this question  -1073741502   the root cause appears to be a  DLL Initialization Failed  error during the compilation and from the following article it is likely to happen when the system is low on what is called Desktop Heap memory  https   blogs msdn microsoft com friis 2012 09 19 c-compiler-or-visual-basic-net-compilers-fail-with-error-code-1073741502-when-generating-assemblies-for-your-asp-net-site     The same blog post suggests to change the app pool account to give more  Desktop Heap memory  or to increase it by changing Windows registry  And the solution to change the app pool account is the one accepted for this answer  https   stackoverflow com a 6929129 1996150  Since the  dynamic compilation  of ASP NET pages appears to be not mandatory if all the code is already compiled within Visual Studio  in many cases similar errors can be solved by manually removing the element   lt system codedom gt   from web config file or removing the Microsoft CodeDom Providers DotNetCompilerPlatform NuGet package  see https   stackoverflow com a 49903967 1996150

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I have crawled through a lot of blog posts including a few Stack nbsp Overflow pots  and I already had everything in place what these posts suggested  see below  when I got this error    My app pool is running under ApplicationPoolIdentity Load user Profile was set to True in Process Model section IIS AppPool DefaultAppPool has full permissions on temp ASP NET files folder   Finally I found some clues in the below mentioned blog post  It looks like there is heap contention with the same user account  So I changed the app pool identity to LocalSystem  for the app which is failing with this error -  and my app started working fine    See blog post C  compiler or Visual Basic  Net compilers fail with error code -1073741502 when generating assemblies for your ASP net site   Note  LocalSystem account will not have much permissions  In my case my application does not need any special permissions  So I was fine  If your application needs special permissions try configuring a custom account

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I got this kind of error too  but the problem was very different explained here  So in my case I got compiler error from temp file that I was using non existing namespace like   using ImaginaryNamespaces    I was sure that code  using ImaginaryNamespaces   dosn t exists in my solution so of course I doubt cache problem  Finally I figured out that the temporary file was some generated source file from configs  My Views Web Config had a line    lt add namespace  ImaginaryNamespaces   gt    After removing this it worked  So I recommend to make sure that there is not any data in configs that might be related to the compiler error

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If you did deploy this application into your server  it s possible that the   config files in folder  bin roslyn were deleted   Then review if exist the files like    csc exe config csi exe config vbc exe config VBCSCompiler exe config   These files can be variate depending on your project references

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What worked for me    It seems if you install  or a dependent package installs  Microsoft CodeDom Providers DotNetCompilerPlatform NuGet package it makes some web config transforms that allow you to use C 7 x features in ASP NET Razor pages  Whilst I found these worked fine on my local machine they didn t work on our server  even when the compiler was in the  bin  folder    The solution was to locate the element below and remove completely from web config     lt system codedom gt       lt compilers gt         lt compiler language  c  cs csharp  extension   cs  type  Microsoft CodeDom Providers DotNetCompilerPlatform CSharpCodeProvider  Microsoft CodeDom Providers DotNetCompilerPlatform  Version 1 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  warningLevel  4  compilerOptions   langversion 6  nowarn 1659 1699 1701    gt         lt compiler language  vb vbs visualbasic vbscript  extension   vb  type  Microsoft CodeDom Providers DotNetCompilerPlatform VBCodeProvider  Microsoft CodeDom Providers DotNetCompilerPlatform  Version 1 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  warningLevel  4  compilerOptions   langversion 14  nowarn 41008  define  MYTYPE   amp quot Web  amp quot   optionInfer     gt       lt  compilers gt     lt  system codedom gt

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In IIS Manager  in the advanced settings of the Application Pool  make sure  Process Model   Load User Profile  is set to  True   In my case it worked

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Delete C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files

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Updating Nuget packages fixed proglem for me

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I removed Roslyn related packages by NuGet and it does work now    Roslyn related packages    Microsoft CodeDom Providers DotNetCompilerPlatform Microsoft Net Compilers    P S  My local IIS doesn t have any problem with Roslyn but as I publish the project on the server  this is why I don t think the server supports Roslyn   it shows the following error message      Compilation Error      Description  An error occurred during the compilation of a resource   required to service this request  Please review the following specific   error details and modify your source code appropriately        Compiler Error Message  The compiler failed with error code -532462766    Show Detailed Compiler Output   C  Windows SysWOW64 inetsrv gt D      wwwroot bin roslyn csc exe  t library  utf8output  nostdlib   R  C  Windows Microsoft NET Framework v4 0 30319 mscorlib dll   R  C  Windows Microsoft Net assembly GAC MSIL System Runtime v4 0 4 0 0 0  b03f5f7f11d50a3a System Runtime dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 08433893 97359c03 e1abd201 System Web WebPages Deployment dll   R  C  Windows Microsoft Net assembly GAC MSIL System Web Extensions v4 0 4 0 0 0  31bf3856ad364e35 System Web Extensions dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 2574b56e eed229e7 dfabd201 Autofac Integration WebApi dll   R  C  Windows Microsoft Net assembly GAC MSIL Microsoft VisualStudio Web PageInspector Loader v4 0 1 0 0 0  b03f5f7f11d50a3a Microsoft VisualStudio Web PageInspector Loader dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 2da0bd13 b2333a9c e0abd201 System Net Http Formatting dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 99fd000f fe3c7c0e e1abd201 System Web WebPages dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 695a732a 7a32e84e e2abd201 WebGrease dll   R  C  Windows Microsoft Net assembly GAC MSIL System Activities v4 0 4 0 0 0  31bf3856ad364e35 System Activities dll   R  C  Windows Microsoft Net assembly GAC 32 System EnterpriseServices v4 0 4 0 0 0  b03f5f7f11d50a3a System EnterpriseServices dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 ca091706 f1f4ae28 78afd201 Core dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 ce3c4f34 2b7b911a e0abd201 EntityFramework SqlServer dll   R  C  Windows Microsoft Net assembly GAC 32 System Data v4 0 4 0 0 0  b77a5c561934e089 System Data dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 c73494ac 8f453228 78afd201 CommonViewModels dll   R  C  Windows Microsoft Net assembly GAC MSIL Microsoft Web Infrastructure v4 0 1 0 0 0  31bf3856ad364e35 Microsoft Web Infrastructure dll   R  C  Windows Microsoft NET Framework v4 0 30319 mscorlib dll   R  C  Windows Microsoft Net assembly GAC MSIL System WorkflowServices v4 0 4 0 0 0  31bf3856ad364e35 System WorkflowServices dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 03d13810 0845500f e1abd201 System Web Http dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 5cc83c73 51b7f8fe e0abd201 System Web Http WebHost dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 290d81d3 fb074b29 78afd201 Data dll   R  C  Windows Microsoft Net assembly GAC MSIL System ServiceModel Activation v4 0 4 0 0 0  31bf3856ad364e35 System ServiceModel Activation dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 7a5d0293 283dbf3a e0abd201 GridMvc dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 eb50e8c6 1900fa91 e0abd201 System Web Razor dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 a7d6ceb3 4c5f9c2c 78afd201 Web dll   R  C  Windows Microsoft Net assembly GAC MSIL System Xml Linq v4 0 4 0 0 0  b77a5c561934e089 System Xml Linq dll   R  C  Windows Microsoft Net assembly GAC MSIL System Web WebPages Deployment v4 0 2 0 0 0  31bf3856ad364e35 System Web WebPages Deployment dll   R  C  Windows Microsoft Net assembly GAC MSIL System Web DynamicData v4 0 4 0 0 0  31bf3856ad364e35 System Web DynamicData dll   R  C  Windows Microsoft Net assembly GAC MSIL System Xml v4 0 4 0 0 0  b77a5c561934e089 System Xml dll   R  C  Windows Microsoft Net assembly GAC MSIL System v4 0 4 0 0 0  b77a5c561934e089 System dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 3bd130ea 7b432ba6 e0abd201 System Web Optimization dll   R  C  Windows Microsoft Net assembly GAC MSIL System ServiceModel v4 0 4 0 0 0  b77a5c561934e089 System ServiceModel dll   R  C  Windows Microsoft Net assembly GAC 32 System Web v4 0 4 0 0 0  b03f5f7f11d50a3a System Web dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 8486430e 674206e7 dfabd201 Autofac Integration Mvc dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 c0d9cc06 83811806 e1abd201 System Web WebPages Razor dll   R  C  Windows Microsoft Net assembly GAC MSIL System Configuration v4 0 4 0 0 0  b03f5f7f11d50a3a System Configuration dll   R  C  Windows Microsoft Net assembly GAC MSIL Microsoft CSharp v4 0 4 0 0 0  b03f5f7f11d50a3a Microsoft CSharp dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 8835020a 58c1c60e e1abd201 System Web Helpers dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 30c33f64 00d8a820 d154d201 Microsoft CodeDom Providers DotNetCompilerPlatform dll   R  C  Windows Microsoft Net assembly GAC MSIL System IdentityModel v4 0 4 0 0 0  b77a5c561934e089 System IdentityModel dll   R  C  Windows Microsoft Net assembly GAC MSIL System ServiceModel Web v4 0 4 0 0 0  31bf3856ad364e35 System ServiceModel Web dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 6ea00d7f 02323228 78afd201 Extensions dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 f8f1e397 e9660a29 78afd201 Services dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 ff57243f bb5e8b92 e0abd201 System Web Mvc dll   R  C  Windows Microsoft Net assembly GAC MSIL System Runtime Serialization v4 0 4 0 0 0  b77a5c561934e089 System Runtime Serialization dll   R  C  Windows Microsoft Net assembly GAC MSIL System Web WebPages Deployment v4 0 1 0 0 0  31bf3856ad364e35 System Web WebPages Deployment dll   R  C  Windows Microsoft Net assembly GAC MSIL System Drawing v4 0 4 0 0 0  b03f5f7f11d50a3a System Drawing dll   R  C  Windows Microsoft Net assembly GAC MSIL System Data DataSetExtensions v4 0 4 0 0 0  b77a5c561934e089 System Data DataSetExtensions dll   R  C  Windows Microsoft Net assembly GAC MSIL System ServiceModel Activities v4 0 4 0 0 0  31bf3856ad364e35 System ServiceModel Activities dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 fd2c5d18 00ae74dd e7acd201 Autofac dll   R  C  Windows Microsoft Net assembly GAC MSIL System Core v4 0 4 0 0 0  b77a5c561934e089 System Core dll   R  C  Windows Microsoft Net assembly GAC MSIL System ComponentModel DataAnnotations v4 0 4 0 0 0  31bf3856ad364e35 System ComponentModel DataAnnotations dll   R  C  Windows Microsoft Net assembly GAC MSIL System Web ApplicationServices v4 0 4 0 0 0  31bf3856ad364e35 System Web ApplicationServices dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 a44c79bb 74928fbb e0abd201 EntityFramework dll   R  C  Windows Microsoft Net assembly GAC MSIL System Web Services v4 0 4 0 0 0  b03f5f7f11d50a3a System Web Services dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 227cd18a 6ab66d28 78afd201 Domain dll   R  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 assembly dl3 8cbb60ec 00788858 b3abd201 Newtonsoft Json dll   out  C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 App Code  bgj8eyw dll   debug-  optimize   warnaserror-  w 4  nowarn 1659 1699 1701 612 618  langversion 6  nowarn 1659 1699 1701   C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 App Code  bgj8eyw 0 cs   C  Windows Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root a47e39f5 cc42bc06 App Code  bgj8eyw 1 cs      How to uninstall the Roslyn packages   In the Solution Explorer  by Right-Click on the web project  select Manage NuGet Packages      Go to Installed tab then search the related Roslyn packages as mentioned at above   Use Uninstall button to delete them

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The version of the Microsoft Net Compilers  3 0  used in my project was incompatible with the version of  NET installed on the server   I downgraded the version to 2 1 and everything work fine now   I guess it s related to the different versions of  Net framework  guessing  NET Core  installed on the server

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I just ran into this on  NET 4 6 1 and it ultimately had a simple solution - I removed  actually commented out  the  section in the web config and the web forms application came back to life  See what-exactly-does-system-codedom-compilers-do-in-web-config-in-mvc-5 for more info   It worked for me

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I resolved this by deleting the contents of the bin and obj folders for the project  and the contents of the bin folder on the remote server  then redeploying

[.net] ASP.NET strange compilation error

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