Unrecognized attribute targetFramework Note that attribute names are case-sensitive

Question

I just installed vs 2010  followed by IIS in window 7  when building a website in  net framework 4 0 and convert this into application in IIS then its shows this error     If i remove the targetFramework  4 0  from web config file then it shows me a second error which is related to linq reference error     This all happening when i am using localhost to run my website but whenever i use just f5  in vs 2010 then its run perfectly   When i want to attach my process with aspnet wp exe i don t find this process in my list   I searched a lot of answers here  What am I missing

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Change the application pool to target framework 4 0 instead of classic     RC website - manage website- advanced setting  the first option change from classic to framework 4 integrated

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You can also open your projects property pages in VS  and in  Build  section choose as  Target Framework  -  NET Framework 4  It helped me with the same issue

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Open Project -  press Shift   F4  Open properties page  -  Chose Build -  in Target Framework chose  NET Framework 4 -  OK

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To fix this problem simply click the ASP NET Version icon in the Site Tools section of Control Panel to switch the framework to 4 0

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Registering the framework with IIS is what worked for me   C  WINDOWS Microsoft NET Framework v4 0 30319 gt aspnet regiis -i

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I had the same issue and I found this nice poweshell script to update all of your app pools at the same time  https   gallery technet microsoft com scriptcenter How-to-set-the-IIS-9c295a20  Make sure to set you  IISAppPoolDotNetVersion    v4 0  variable at the top

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Just had this in VS 2010   Fixed by editing the  sln file and changing the TargetFrameworkMoniker to have the value   NETFramework Version 3Dv4 0  assigned to it

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Your current  Net Framework version 2 0   Net Framework Version 4 0 or more than 4 0  is not installed on your server  Update your  Net Framework Version  If not solved yet  you have to change your IIS  Net Framework Version settings and select the  Net Framework Version 4 0

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For layering  Just change the version of targetFramework in web config file only  the other things no need change

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for IIS 7 try according to the given picture     mark me helpful if it works for you

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From Control Panel open IIS manager -  on Left side select  Application Pools  -  Now on middle part your project listing display then select your project e g   MvcApplication1  -  from right side select  set Application Pool Defaults  -  Now change  Net Framework Version from V2 0 to V4 0   This one is work for me but make sure you have already installed  Net Framework 4 0

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I had to register ASP Net in IIS to get it resolved in the Windows Server 2008 R2  Sreenshot of the commands attched below  cd  d C  Windows Microsoft NET Framework v4 0 30319  iisreset  stop  aspnet regiis -i  iisreset  start   systemroot  system32 inetsrv appcmd set config  section isapiCgiRestriction   path   windir  Microsoft NET Framework v4 0 30319 aspnet isapi dll   allowed True    systemroot  system32 inetsrv appcmd set config  section isapiCgiRestriction   path   windir  Microsoft NET Framework64 v4 0 30319 aspnet isapi dll   allowed True

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Changing the port number for the local development helped me Thanks  Rinay Ashokan  I have done all the trouble shooting and finally found that the project configurations are stored in the IIS express for the port number

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In Visual Studio menu      Website -  Start Options -  build tab -  Select Target Framework in   Dropdown box   NET FrameWork 4

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I also got the same issue while running my application locally which is pointing to  Net Framework 4 7 1   The bug was  Unrecognized attribute TargetFrameWork  as shown below    But none of the above answers helped me  At last when I changed my present port  1413  number  to some other value 60179  as shown below it worked fine for me But I am not sure for the actual reason behind this   but it worked

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What I did  I did change the value of Application Pool to DefaultAppPool from a previous value  You do this in the Advanced Settings  Website --  Manage Website --  Advanced Setting

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Just had this issue deploying a new app to an old IIS box  The investigation led to the v4 5 1 run-time being installed but the app requiring v4 5 2  Nothing apart from installing the correct version of ASP  Net run-time was required

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If you compile the files and the value of the  targetFramework  is set as being a particular version i e  4 0   Make sure the host is running  net framework as the same version stated    If not  download the  net framework    After downloading  if it is not automatic being set in the IIS manager to be using the extension of the newly downloaded version of  net framework   add the extension manually by going to the folder of the recently downloaded  net framework THROUGH IIS manager   1 right-click website folder  2 go to  Properties   3 under  virtual directory    click  configuration    4 edit the executable path of extension   aspx   of which the path being pointed to version other than the version of the recently downloaded  net framework  to the correct path which is the folder of the NEWLY downloaded version of  net framework and then select the  aspnet isapi dll  file   5 click ok

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Saw the error  Unrecognized attribute  targetFramework   in the  Console output  page of Jenkins on a build server  This was after I changed the  target framework  for several projects from   NET Framework 3 5  to   NET Framework 4  and committed my changes   In Jenkins the project settings had to be changed  For the solution the  MSBuild Version  had to be changed from  v3 5  to  v4 0

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For anyone having this who doesn t have IIS running on their dev PC  here s what happened to me  I had one website on  overwrote with files from a diff website that was 4 while the previous was 3 5  Got this error  Fixed it simply by changing the directory name of the website  which on a dev PC can be anything  so no problem   The above are probably more elegant to be sure  but sometimes simple works  IF you can get away with it  i e   you re in dev rather than QA or Prod

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Run the following command to fix this problem   Start --  Run    windir  Microsoft NET Framework v4 0 30319 aspnet regiis exe    i  If you get an error about ADMIN rights you need to do the following   1  CTRL SHIFT ENTER from the RUN menu will run as ADMIN 2  START -- gt  PROGRAMS -- gt  ACCESSORIES -- gt  Right-click on command prompt and  run as administrator

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I m using IIS Express  rather than IIS   The problem was in the applicationhost config file located in   solution folder   vs config applicationhost config   One of the application pool entries had a managedRuntimeVersion value of  v2 0    I changed it to  v4 0   and it worked properly   I m fairly sure the root cause was one of the NuGet packages I had installed recently        lt system applicationHost gt          lt applicationPools gt             lt add name  BadAppPool1  managedRuntimeVersion  v2 0  managedPipelineMode  Integrated  CLRConfigFile   IIS USER HOME  config aspnet config  autoStart  true    gt          lt  applicationPools gt       lt  system applicationHost gt

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It could be that you have your own MSBUILD proj file and are using the  lt AspNetCompiler gt  task  In which case you should add the ToolPath for  NET4    lt AspNetCompiler     VirtualPath   MyFacade      PhysicalPath    MSBuildProjectDirectory  MyFacade       TargetPath    MSBuildProjectDirectory  Release MyFacade      Updateable  true      Force  true      Debug  false      Clean  true      ToolPath  C  Windows Microsoft NET Framework v4 0 30319   gt         lt  AspNetCompiler gt

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following 2 steps will force refresh Visual Studio and IIS Express cache and usually resolve my similar issues    Simply switch Project framework from 4  to  Net framework 3 5 and run it If it ran successfully you can revert it back to your desired 4  target framework and see that it will probably work again

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This typically happens when you have an attribute of targetFramework  4 0  in the web config but the App Pool is set to run ASP NET 2 0  The targetFramework attribute is entirely unrecognized by ASP NET 2 0 - so changing it to 2 0 won t have the desired effect   Contact Support   Your Administrator and have the AppPool switched to 4 0   You could also remove the attribute entirely  however if your site was coded with the 4 0 Framework  then I m sure something else will cause an error as well

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Follow these two steps   Register the  net framework version version 4 0  if it is not registered    C  WINDOWS Microsoft NET Framework v4 0 30319 aspnet regiis -i In the app pool change the  net framework to v4 0

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Just Remove the  Target Framework 4 0   and close the bracket   It will Work

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I was facing the same issue while publishing my 1 st web services  I resolved it by simply doing this         Open IIS   Click on Application Pools   Right Click on DefaultAppPool     Set Application Pool Default    Change  Net Version to V 4 0   You can also change    Net Framework Version of your application specifically       Hope  it ll work

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If you re using IIS Express  it creates a new configuration for each site that you run  and it s bound to the url  host port   However  when it opens a new project using the same port it doesn t refresh the configuration  This means that if you have a project using CLR 2 0   NET Framework 2 0 to 3 5  running on some port and then later you open another project in the same port using CLR 4   NET Framework 4 x   the new project will try to run using CLR 2  which fails - and in case it doesn t even recognize the  quot targetFramework quot  attribute  One solution is cleaning IIS Express sites  but the easiest method is changing the port so that IIS Express will create a new site  using CLR 4  for your project

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open your IIS  type inetmgr in run  and change your Application pool setting To view large this Image Right Click Image and open image in new tab

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Open your IIS  click on your application pool and change the settings there   Click the defaultAppPool and check the  Net Clear version if version 4 0 is present  you can perhaps change the pipeline mode to integrated

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Create a new pool by selecting  Net Framework v4 0 3xxxxx  use the Manage Pipeline Mode  Integrated   Assign it to your site and done

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In IIS   Click on Application Pools  Right Click on DefaultAppPool ---   Set Application Pool Default    ---  Change  Net Version to V 4 0

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If you install the IIS after the installation of  Net FrameWork  You need install the  net framework again for IIS  So all we need to do is run aspnet regiis -i  Hope it is helpful

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You ll likely need to re-register ASP Net version 4 with IIS   Navigate to your  net framework 4 0 folder  and run aspnet regiis exe -i  For example  my  net framework 4 0 folder  Server 2k8 R2 x64  was located at  C  Windows Microsoft NET Framework64 v4 0 30319

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I had this error from a failed MSBuild compile  in a project file converted from an earlier version of VS into VS2010 and  NET 4 0  It was actually a Web Deployment project  and the solution that worked for me was adding the following entries into the PropertyGroup section at the start of the MSBuild file    lt ProductVersion gt 10 0 11107 lt  ProductVersion gt    lt TargetFrameworkVersion gt v4 0 lt  TargetFrameworkVersion gt    Maybe these get automatically updated when other types of project are converted in VS2010  but they were missing from my Web Deployment project file after it was converted

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The problem could be     the Application Pool for your site is configured for  NET Framework Version   v2 0 XXXXX   NET 4 isn t installed on your server    See also     Unrecognized attribute  targetFramework        How to add ASP NET 4 0             which helped me fix a similar issue

[asp.net] Unrecognized attribute 'targetFramework'. Note that attribute names are case-sensitive

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