Could not load file or assembly 'Antlr3.Runtime' or one of its dependencies

Question

I find a similar question, but no solution for my issue.

Could not load file or assembly 'Antlr3.Runtime' or one of its dependencies. This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded

I'm getting this error only in IIS. I'm trying to deploy to IIS 7.5. I set the application pool as 4.0, Integrated.

Earlier everything was working fine. After I installed framework 4.5 VS 2012 express I got an exception using the MachineKeyCryptography. So I uninstalled 4.5 framework and VS 2012 due to which this mess is happening.

The exception I'm getting is below.

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.BadImageFormatException: Could not load file or assembly 'Antlr3.Runtime' or one of its dependencies. This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded.

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 'Antlr3.Runtime' could not be loaded.

WRN: Assembly binding logging is turned OFF. To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1. Note: There is some performance penalty associated with assembly bind failure logging. To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].

Stack Trace:

[BadImageFormatException: Could not load file or assembly 'Antlr3.Runtime' or one of its dependencies. This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded.] System.Reflection.Assembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection) +0
System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) +416
System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) +166 System.Reflection.Assembly.Load(String assemblyString) +35
System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +190

[ConfigurationErrorsException: Could not load file or assembly 'Antlr3.Runtime' or one of its dependencies. This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded.]
System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +11244040
System.Web.Configuration.CompilationSection.LoadAllAssembliesFromAppDomainBinDirectory() +388 System.Web.Configuration.CompilationSection.LoadAssembly(AssemblyInfo ai) +232
System.Web.Configuration.AssemblyInfo.get_AssemblyInternal() +48
System.Web.Compilation.BuildManager.GetReferencedAssemblies(CompilationSection compConfig) +210
System.Web.Compilation.BuildProvidersCompiler..ctor(VirtualPath configPath, Boolean supportLocalization, String outputAssemblyName) +76 System.Web.Compilation.ApplicationBuildProvider.GetGlobalAsaxBuildResult(Boolean isPrecompiledApp) +283
System.Web.Compilation.BuildManager.CompileGlobalAsax() +50
System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() +676

[HttpException (0x80004005): Could not load file or assembly 'Antlr3.Runtime' or one of its dependencies. This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded.]
System.Web.Compilation.BuildManager.ReportTopLevelCompilationException() +76 System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() +1012 System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters) +1025

[HttpException (0x80004005): Could not load file or assembly 'Antlr3.Runtime' or one of its dependencies. This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded.] System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +11338038
System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +88 System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +4356276

Answer 1

u need to change the runtime version of it in IIS. right click on virtual directory and click on advanced settings change it to correct pool settings. I can say that your pool settings are not right there after reinstallation.

You can find the procedure as

In Application Pools-> Select your site ->Set Application Pool Defaults -> Select your correct version

If this is not working, preferred thing you can do at this point is uninstalling all the .Net installations from your system referencing to framework 4. Clean your system and then reinstall everything freshly.

But i see that you are using IIS 7.5. So you can find lots of functional changes happening and needs to be dealt carefully. you can try setting your Application Pool and other settings before trying to reinstall.