Cannot find the user '', because it does not exist or you do not have permission

Question

I am trying to add permissions to a Store procedure for a user using this query,

USE [MyDatabaseName]
GO

GRANT EXEC ON [dbo].[StoreProcedureName] TO [UserNa         


        

Answer 1

You can get problems like this when a database has been restored from another server and the GUID of the user in the database is different from that of the current server.

This will re-link orphaned users:

USE ;
GO
sp_change_users_login @Action='update_one', @UserNamePattern='', 
   @LoginName='';
GO

other than this, if the user exists and you have the relevant security rights, there is no reason what you doing wouldn't work.