Exception: Found different versions of the same type

[Azel]

I encounter the following Inner exception when trying to query for data:

Found different versions of the same type 'ExperienceAttendanceSystem.Student'; only one can be supported.
Conflicting: file:///C:/Users/<userprofile>/AppData/Local/Temp/Temporary ASP.NET Files/root/7f4f6ad9/51a443ed/App_Code.79pup705.DLL
With: file:///C:/Users/<userprofile>/documents/visual studio 2010/Projects/ExperienceAttendanceSystem/ExperienceAttendanceSystem/bin/ExperienceAttendanceSystem.DLL
Make sure to reference only one version of a type.

My code is:

           IObjectScope scope = ObjectScopeProvider1.GetNewObjectScope();

            try
            {
                scope.Transaction.Begin();

                var student = from s in scope.Extent<Student>()
                              where s.Id == batchorid || s.Currentbatch == batchorid
                              select s;





                return student.ToList<Student>();
            }
            finally
            {
                scope.Transaction.Commit();
            }

 
I tried removing the cache but the exception still shows whenever I tried to compile at return student.ToList<Student>();

[Thomas]

Hello Azel,

this is an error message when our runtime encounters two types with the same name. Ususally it indicates, that there are two versions of the logically same assembly are loaded into memory. For your case it should be sufficient to restart the ASP development server and rebuild your application.

Kind regards,
Thomas
the Telerik team

[Jim]

I have a similar message, given below. The steps above did not work for me.  Since the problem involves the GAC, I tried removing the old version from the GAC, using the method at http://blogs.msdn.com/b/mossbiz/archive/2010/06/10/add-an-assembly-to-the-global-assembly-cache-on-windows-server-2008-r2.aspx, but was unable to make any changes at all to the GAC.

Finally I uninstalled ORM and re-installed it.  This updated the copy in the GAC and solved the problem

Message:
System.Configuration.ConfigurationErrorsException:
Found different versions of the same type 'Telerik.OpenAccess.RT.OID.SingleFieldIdentity'; only one can be supported.
Conflicting: file:///E:/Documents/Visual Studio 2010/Projects/VgTest/VgTest.Web/bin/Telerik.OpenAccess.DLL
With: file:///C:/Windows/assembly/GAC_MSIL/Telerik.OpenAccess/2010.1.623.5__7ce17eeaf1d59342/Telerik.OpenAccess.dll

[Damyan Bogoev]

Hello James,

We are glad to see that you have managed to solve this problem.
If any other problems arise please contact us back.

Kind regards,
Damyan Bogoev
the Telerik team