Runtime error Could not load file or assembly System Web WebPages Razor Version 3 0 0 0

Question

I tinkered with my ASP NET MVC4 packages via NuGet  and now System Web WebPages Razor v3 won t load   Sometimes other packages won t load either   My coworker runs the solution without any trouble  so the issue is definitely configuration on my development system  as opposed to anything that s been checked in    I have already tried the recommendations at various SOf and other fora links  including    Could not load file or assembly   39 System Web WebPages Razor  Version 2 0 0 0  Could not load file or assembly   39 System Web WebPages Razor  Version 2 0 0 0 Could not load file or assembly   39 System Web WebPages Razor  Version 3 0 0 0   As well as suggestions linked from there   I also checked the Control Panel and found no installed programs that referenced MVC    If it matters  I m running MS Win 7 SP 1    I am open to any and all suggestions   Here s my core dump info      Server Error in     Application       Could not load file or assembly  System Web WebPages Razor  Version 3 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  or   one of its dependencies  The system cannot find the file specified       Description  An unhandled exception occurred during the execution of the current web request  Please review the stack trace for more   information about the error and where it originated in the code        Exception Details  System IO FileNotFoundException  Could not load file or assembly  System Web WebPages Razor  Version 3 0 0 0    Culture neutral  PublicKeyToken 31bf3856ad364e35  or one of its   dependencies  The system cannot find the file specified   Source Error    An unhandled exception was generated during the execution of the current web request  Information regarding the origin and location of       the exception can be identified using the exception stack trace below   Assembly Load Trace  The following information can be helpful to determine why the assembly  System Web WebPages Razor        Version 3 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35    could not be loaded           Pre-bind state information           LOG  User   CodesWithHammer       LOG  DisplayName   System Web WebPages Razor  Version 3 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35         Fully-specified        LOG  Appbase   file    c  users CodesWithHammer documents visual studio 2012 Projects MPP MPP        LOG  Initial PrivatePath   c  users CodesWithHammer documents visual studio   2012 Projects MPP MPP bin       Calling assembly   Microsoft Web WebPages OAuth  Version 3 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35                 LOG  This bind starts in default load context        LOG  Using application configuration file  c  users CodesWithHammer documents visual studio   2012 Projects MPP MPP web config       LOG  Using host configuration file  C  Users CodesWithHammer Documents IISExpress config aspnet config       LOG  Using machine configuration file from C  Windows Microsoft NET Framework v4 0 30319 config machine config        LOG  Post-policy reference  System Web WebPages Razor  Version 3 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35       LOG  Attempting download of new URL file    C  Users CodesWithHammer AppData Local Temp Temporary ASP NET   Files root 5bf3ca07 f960d9c5 System Web WebPages Razor DLL        LOG  Attempting download of new URL file    C  Users CodesWithHammer AppData Local Temp Temporary ASP NET   Files root 5bf3ca07 f960d9c5 System Web WebPages Razor System Web WebPages Razor DLL        LOG  Attempting download of new URL file    c  users CodesWithHammer documents visual studio   2012 Projects MPP MPP bin System Web WebPages Razor DLL        LOG  Attempting download of new URL file    c  users CodesWithHammer documents visual studio   2012 Projects MPP MPP bin System Web WebPages Razor System Web WebPages Razor DLL        LOG  Attempting download of new URL file    C  Users CodesWithHammer AppData Local Temp Temporary ASP NET   Files root 5bf3ca07 f960d9c5 System Web WebPages Razor EXE        LOG  Attempting download of new URL file    C  Users CodesWithHammer AppData Local Temp Temporary ASP NET   Files root 5bf3ca07 f960d9c5 System Web WebPages Razor System Web WebPages Razor EXE        LOG  Attempting download of new URL file    c  users CodesWithHammer documents visual studio   2012 Projects MPP MPP bin System Web WebPages Razor EXE        LOG  Attempting download of new URL file    c  users CodesWithHammer documents visual studio   2012 Projects MPP MPP bin System Web WebPages Razor System Web WebPages Razor EXE       Stack Trace     FileNotFoundException  Could not load file or assembly  System Web WebPages Razor  Version 3 0 0 0  Culture neutral        PublicKeyToken 31bf3856ad364e35  or one of its dependencies  The   system cannot find the file specified            Microsoft Web WebPages OAuth PreApplicationStartCode Start    0   InvalidOperationException  The pre-application start initialization method Start on type       Microsoft Web WebPages OAuth PreApplicationStartCode threw an   exception with the following error message  Could not load file or   assembly  System Web WebPages Razor  Version 3 0 0 0  Culture neutral    PublicKeyToken 31bf3856ad364e35  or one of its dependencies  The   system cannot find the file specified             System Web Compilation BuildManager InvokePreStartInitMethodsCore ICollection1   methods  Func1 setHostingEnvironmentCultures   550          System Web Compilation BuildManager InvokePreStartInitMethods ICollection 1   methods   132          System Web Compilation BuildManager CallPreStartInitMethods String   preStartInitListPath   90          System Web Compilation BuildManager ExecutePreAppStart    135          System Web Hosting HostingEnvironment Initialize ApplicationManager   appManager  IApplicationHost appHost  IConfigMapPathFactory   configMapPathFactory  HostingEnvironmentParameters hostingParameters    PolicyLevel policyLevel  Exception appDomainCreationException   516   HttpException  0x80004005   The pre-application start initialization method Start on type       Microsoft Web WebPages OAuth PreApplicationStartCode threw an   exception with the following error message  Could not load file or   assembly  System Web WebPages Razor  Version 3 0 0 0  Culture neutral    PublicKeyToken 31bf3856ad364e35  or one of its dependencies  The   system cannot find the file specified             System Web HttpRuntime FirstRequestInit HttpContext context   9874840          System Web HttpRuntime EnsureFirstRequestInit HttpContext context   101          System Web HttpRuntime ProcessRequestNotificationPrivate IIS7WorkerRequest   wr  HttpContext context   254      Version Information  Microsoft  NET Framework Version 4 0 30319  ASP NET Version 4 0 30319 18055    For those who read this far   I don t have enough reputation to make the tag pulling-out-my-hair   If there s an appropriate extant tag  please include that   KTHX    ETA   When I tried manually updating Microsoft AspNet Mvc to version 3  here s the error I got on Package Manager Console      Install failed  Rolling back    Install-Package   Updating    Microsoft AspNet Mvc 5 0 0  to  Microsoft AspNet Mvc 3 0 20105 1    failed  Unable to find a version of    Microsoft AspNet Mvc FixedDisplayModes  that is compatible wi th    Microsoft AspNet Mvc 3 0 20105 1   At line 1 char 16     Install-Package  lt  lt  lt  lt   Microsoft AspNet Mvc -Version 3 0 20105 1         CategoryInfo            NotSpecified       Install-Package   InvalidOperationException         FullyQualifiedErrorId   NuGetCmdletUnhandledException NuGet PowerShell Commands InstallPackageCommand   ETA2   I got the packages directory from my coworker   They have MS AspNet Mvc v5  and they re running just fine   But they ALSO have MS AspNet Mvc FixedDisplayModes v5   So I m going to add both of those in   And yes  I have backed up my entire solution      ETA3   So I re-upgraded to AspNet MVC v5  and skipped the deprecated Mvc FixedDisplayNodes   Then I got a problem with conflicting versions of AspNet WebPages  so I used this fix   Conflicting versions of ASP NET Web Pages detected  specified version is  quot 1 0 0 0 quot   but the version in bin is  quot 2 0 0 0 quot  in ASP MET MVC 3  And now my project runs   Thanks all for the help

User · Answer

Is there a System Web WebPages Razor dll in the bin folder of your web app  What is its version   Explorer right click  properties  I m guessing it s not 3 0 0 0  Just get the nuget packages for v3 0 0 0  perhaps by copying the packages folder from your colleague  Or install it manually  http   www nuget org packages Microsoft AspNet Mvc 3 0 20105 1  EDIT  if you copy stuff from your colleague  also copy the relevant version numbers into packages config  This is what tells nuget which versions to put into the packages folder

User · Answer

I had this issue when I upgraded to v3 0 0 preview4  so a downgrade to a stable version fixed this

User · Answer

same thing JUST happened to me with NUGET   the following tag helped   lt runtime gt   lt assemblyBinding xmlns  urn schemas-microsoft-com asm v1  gt     lt dependentAssembly gt       lt assemblyIdentity name  System Web WebPages Razor  PublicKeyToken  31bf3856ad364e35   gt       lt bindingRedirect oldVersion  1 0 0 0-3 0 0 0  newVersion  3 0 0 0   gt     lt  dependentAssembly gt    Also if this is happening on the server  I had to make sure I was running the application pool on a more  privileged account  to the file system  but I don think that s your issue here

User · Answer

in the new actionmailer   razorengine  is a dependency  The latest version of Razorengine installs the dependency to System Web Razor 3 0 0   If you use an earlier version in your application  i suppose you are using actionmailer in another project and that you reference the mail functionality from another project  than you get this issue of course   In an earlier application  i had a webapplication MVC that uses system web Razor version 2 0 0  Of course  i got the issue to   How to fix     Simple    Just uninstall the entire actionmailer in your actionmailer project  Install a previous version of RazorEngin      Install-Package RazorEngine -Version 3 3 0  because version 3 3 0 will reference system web razor 2 0 0    Install actionmailer again  it will not install the latest version of RazorEngin because you allready did that yourselve       Succes

User · Answer

I got the same error  what worked for me is    Fix references error  Close Visual Studio  Delete Packages  Delete  vs folder  Run Project Again  Rebuild Project

User · Answer

You can find it in Nuget Package Microsoft ASP NET Web Pages Version 3 2 0    If you have a reference to an earlier version than 3 0 0 0  Delete the reference  add the reference to the correct  dll in your packages folder and make sure  Copy Local  is set to  True  in the properties of the  dll   Then in your web config  as mentioned by  MichaelEvanchik      lt runtime gt   lt assemblyBinding xmlns  urn schemas-microsoft-com asm v1  gt     lt dependentAssembly gt       lt assemblyIdentity name  System Web WebPages Razor  PublicKeyToken  31bf3856ad364e35   gt       lt bindingRedirect oldVersion  1 0 0 0-3 0 0 0  newVersion  3 0 0 0   gt     lt  dependentAssembly gt   lt  assemblyBinding gt

User · Answer

In my case the issue didn t resolve by following any of the above methods  I had all the paths in my package config correct and the dll s were in place as referred  I was still getting run time error for System Web WebPages Razor   I changed the localhost port number and this worked  I am not sure of why I had the issue and why changing the port number resolved it  Just posting this as I feel this might be useful for someone out there

User · Answer

I got this error because such DLL  and many others  were missing in bin folder when I pubished the web application  It seemed like a bug in Visual Studio publish function  Cleaning  recompiling and publishing it again  made such DLLs to be published correctly

User · Answer

I did not want to install visual studio and development environment  so I have installed AspNetMVC4Setup exe in Windows server 2016 machine and it solved the problem  The installer was downloaded from Microsoft website

User · Answer

I got this problem because I uninstalled VS 2012  I don t want to reinstall it back  so I downloaded the AspNetMVC4Setup exe from Microsoft com and fixed my problem    https   www microsoft com en-us download details aspx id 30683

User · Answer

In my case  the issue was not about binding redirects or missing mismatched Microsoft AspNet Razor package dlls  so the above solutions didn t work   The issue  in my non-web project  was that RazorEngine Microsoft AspNet Razor were installed in a different project  Project A  than the calling assembly start-up project  Project B   Because there s no explicit reference to Razor  the System Web Razor did NOT get copied to  bin in a Release build    The solution was to Install RazorEngine Microsoft AspNet Razor in the application entry point  Project B  ConsoleApplication in my case   then the System Web Razor gets copied to  bin and everyone s happy

User · Answer

Update-Package    reinstall Microsoft AspNet WebPages   Reinstall Microsoft AspNet WebPages nuget packages using this command in the package manager console  100  work

[c#] Runtime error: Could not load file or assembly 'System.Web.WebPages.Razor, Version=3.0.0.0

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