Error in ErrorLog Modules

Dec 27, 2013 at 9:20 PM
I get this error while running my application

__An unhandled exception of type 'System.ExecutionEngineException' occurred in Unknown Module.
and after this my iis get crashed. I have added this to my webconfig files

  <add name="ErrorLog" type="OrbitOne.Elmah.HttpModule.O1ErrorLogModule,OrbitOne.Elmah,Version=,Culture=neutral,PublicKeyToken=ab9cc0e617757f7b" preCondition="integratedMode"  />
  <add name="ErrorFilter" type="OrbitOne.Elmah.HttpModule.O1ErrorFilterModule, OrbitOne.Elmah, Version=,Culture=neutral,PublicKeyToken=ab9cc0e617757f7b" />
I am also using telerik controls in my application