Unable to load one or more of the requested types, on EP installation

Hi,

Ep installer gives an error:

Leaving function RemoveOldWebPartPackage
    Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.
       at System.Reflection.Module._GetTypesInternal(StackCrawlMark& stackMark)
       at System.Reflection.Assembly.GetTypes()
       at ClrBridgeImpl.GetTypes(ClrBridgeImpl* , Char* assemblyName, Boolean* isException)
    

    Could not load file or assembly 'Microsoft.Dynamics.Kernel.Client, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
       at System.Reflection.Assembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection)
       at System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)
       at System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)
       at System.AppDomain.Load(String assemblyString)
       at ClrBridgeImpl.LoadAssembly(ClrBridgeImpl* , Char* assemblyName)
       at ClrBridgeImpl.GetTypes(ClrBridgeImpl* , Char* assemblyName, Boolean* isException)

how can I solve this issue?

I've already compiled   SysEPDeployment, SysDevelopmentProxy classes, whole application and still no changes....

Any help would be appreciated