No Mapping Specified Error in Entity Framework 4 with Asp.net MVC3 -


I am working with ASP.NET MVC3 with Entity Framework 4, I updated my model and when I compile my solution, the show has succeeded in the status bar but error is showing the following error in the dock window

No mapping specified for the following entity / association set - Categories, Users, Roles.

The first page (a login panel) without any errors or warnings, but when I click on login after entering the credentials, I give the following exception:

Command Definition An internal error occurred while doing an error while doing the error.

I am not very familiar with the institution structure, so please help me solve this problem .....

To correct the error, follow the steps below: 

  Click Update Model, delete the wrong table, then click on Update Model Add deleted tables, create your project and it will now work

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