Failed to load JIT compiler

[Ken]

Anyone know how to fix this error?
Server Error in '/' Application.
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Failed to load JIT compiler
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.Executio nEngineExceptio n: Failed to load JIT
compiler

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:

[ExecutionEngine Exception: Failed to load JIT compiler]
__ASP.FastObjec tFactory_app_we b_login_aspx_cd cab7d2_qnnkuml1 .Create_ASP_log in_aspx()
+0
System.Web.Comp ilation.BuildRe sultCompiledTyp e.CreateInstanc e() +49
System.Web.Comp ilation.BuildMa nager.CreateIns tanceFromVirtua lPath(VirtualPa th
virtualPath, Type requiredBaseTyp e, HttpContext context, Boolean
allowCrossApp, Boolean noAssert) +115
System.Web.UI.P ageHandlerFacto ry.GetHandlerHe lper(HttpContex t context,
String requestType, VirtualPath virtualPath, String physicalPath) +31
System.Web.UI.P ageHandlerFacto ry.System.Web.I HttpHandlerFact ory2.GetHandler (HttpContext
context, String requestType, VirtualPath virtualPath, String physicalPath)
+40
System.Web.Http Application.Map HttpHandler(Htt pContext context, String
requestType, VirtualPath path, String pathTranslated, Boolean useAppConfig)
+139
System.Web.MapH andlerExecution Step.System.Web .HttpApplicatio n.IExecutionSte p.Execute()
+120
System.Web.Http Application.Exe cuteStep(IExecu tionStep step, Boolean&
completedSynchr onously) +155

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Version Information: Microsoft .NET Framework Version:2.0.507 27.42; ASP.NET
Version:2.0.507 27.42