Server Error in '/onlines/slex' Application.

The value for the 'compilerVersion' attribute in the provider options must be 'v4.0' or later if you are compiling for version 4.0 or later of the .NET Framework. To compile this Web application for version 3.5 or earlier of the .NET Framework, remove the 'targetFramework' attribute from the <compilation> element of the Web.config file.

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.Configuration.ConfigurationErrorsException: The value for the 'compilerVersion' attribute in the provider options must be 'v4.0' or later if you are compiling for version 4.0 or later of the .NET Framework. To compile this Web application for version 3.5 or earlier of the .NET Framework, remove the 'targetFramework' attribute from the <compilation> element of the Web.config file.

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.

Stack Trace:


[ConfigurationErrorsException: The value for the 'compilerVersion' attribute in the provider options must be 'v4.0' or later if you are compiling for version 4.0 or later of the .NET Framework. To compile this Web application for version 3.5 or earlier of the .NET Framework, remove the 'targetFramework' attribute from the <compilation> element of the Web.config file.]
   System.Web.Compilation.MultiTargetingUtil.ValidateCompilerVersionFor40AndAbove(String compilerVersion) +235
   System.Web.Compilation.MultiTargetingUtil.ValidateCompilerVersionFor40AndAbove() +76
   System.Web.Compilation.MultiTargetingUtil.InitializeTargetFrameworkName() +9221667
   System.Web.Compilation.MultiTargetingUtil.EnsureFrameworkNamesInitialized() +149
   System.Web.Compilation.BuildManager.Initialize() +204
   System.Web.Compilation.BuildManager.InitializeBuildManager() +246
   System.Web.HttpRuntime.HostingInit(HostingEnvironmentFlags hostingFlags, PolicyLevel policyLevel, Exception appDomainCreationException) +530

[HttpException (0x80004005): The value for the 'compilerVersion' attribute in the provider options must be 'v4.0' or later if you are compiling for version 4.0 or later of the .NET Framework. To compile this Web application for version 3.5 or earlier of the .NET Framework, remove the 'targetFramework' attribute from the <compilation> element of the Web.config file.]
   System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +9172928
   System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +97
   System.Web.HttpRuntime.ProcessRequestInternal(HttpWorkerRequest wr) +258


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1031