No mapping exists from object type System.Collections.Generic.List when executing stored proc with parameters in EF 4.3

Question

Lately I\'ve been working on stored procedure and encountered 1 strange problem.

First, I was able to successfully call a stored procedure from the database via:

Answer 1

If the stored procedure is only for update/insert, the following can be used as well.

string cmd = Constants.StoredProcs.usp_AddRoles.ToString() + " @userId, @roleIdList";
int result = db.Database
                        .ExecuteSqlCommand
                        (
                           cmd,
                           new SqlParameter("@userId", userId),
                           new SqlParameter("@roleIdList", roleId)
                        );