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Version 6.x > Bug reports > Could not load file or assembly 'FSharp.Core View modes: 
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netjib_david - 5/17/2012 9:02:47 AM
Could not load file or assembly 'FSharp.Core
Hi guys

I am not sure if this is a bug but on one of my recent recent site build on 6 SP1 I tend to get the following error on some cold start (e.g. first visit of the day).

Since the site was upgraded from 6.0 to 6.0.23 at first I thought it was an issue with the upgrading process so I re-built the site on a clean install (i.e. from 6.0.23 web installer) but it keeps on sometimes appearing.

Any thought on what might cause this is welcome.

Log extract:

Event ID: 410
Event type: Error
Event time: 5/17/2012 2:41:33 PM
Source: Application_Error
Event code: EXCEPTION
User ID: 65
User name: public
IP address: ::1
Node ID: 3
Document name: Home

Description: Message: Could not load file or assembly 'FSharp.Core, Version=, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
Stack Trace:
at System.ModuleHandle.ResolveType(RuntimeModule module, Int32 typeToken, IntPtr* typeInstArgs, Int32 typeInstCount, IntPtr* methodInstArgs, Int32 methodInstCount, ObjectHandleOnStack type)
at System.ModuleHandle.ResolveTypeHandleInternal(RuntimeModule module, Int32 typeToken, RuntimeTypeHandle[] typeInstantiationContext, RuntimeTypeHandle[] methodInstantiationContext)
at System.Reflection.RuntimeModule.ResolveType(Int32 metadataToken, Type[] genericTypeArguments, Type[] genericMethodArguments)
at System.Reflection.CustomAttribute.FilterCustomAttributeRecord(CustomAttributeRecord caRecord, MetadataImport scope, Assembly& lastAptcaOkAssembly, RuntimeModule decoratedModule, MetadataToken decoratedToken, RuntimeType attributeFilterType, Boolean mustBeInheritable, Object[] attributes, IList derivedAttributes, RuntimeType& attributeType, IRuntimeMethodInfo& ctor, Boolean& ctorHasParameters, Boolean& isVarArg)
at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, Int32 pcaCount, RuntimeType attributeFilterType, Boolean mustBeInheritable, IList derivedAttributes, Boolean isDecoratedTargetSecurityTransparent)
at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeAssembly assembly, RuntimeType caType)
at System.Reflection.RuntimeAssembly.GetCustomAttributes(Boolean inherit)
at System.Web.UI.AssemblyCache.GetAjaxFrameworkAssemblyAttribute(Assembly assembly)
at System.Web.UI.ScriptManager.get_DefaultAjaxFrameworkAssembly()
at System.Web.UI.ScriptManager..ctor()
at ASP.cmspages_portaltemplate_aspx.__BuildControlmanScript()
at ASP.cmspages_portaltemplate_aspx.__BuildControlplcManagers()
at ASP.cmspages_portaltemplate_aspx.__BuildControlform()
at ASP.cmspages_portaltemplate_aspx.__BuildControlTree(cmspages_portaltemplate_aspx __ctrl)
at ASP.cmspages_portaltemplate_aspx.FrameworkInitialize()
at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
at System.Web.UI.Page.ProcessRequest()
at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context)
at System.Web.UI.Page.ProcessRequest(HttpContext context)
at ASP.cmspages_portaltemplate_aspx.ProcessRequest(HttpContext context)
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Site name: [omitted]
Machine name: [omitted]
Event URL: /home.aspx
URL referrer:
User agent: Mozilla/5.0 (Windows NT 6.0) AppleWebKit/536.5 (KHTML, like Gecko) Chrome/19.0.1084.46 Safari/536.5

User avatar
Kentico Support
Kentico Support
kentico_jurajo - 5/17/2012 11:14:15 AM
RE:Could not load file or assembly 'FSharp.Core

Are you using any custom assemblies or DLL files? The FSharp.Core which is in the error message is not coming from Kentico. If you are using any custom DLLs/assemblies, have you updated the references after the hotfix upgrade and re-built the solution?

Best regards,
Juraj Ondrus