How to enable SQL Debugging.

SQL Server has a built-in extended stored procedure, named sp_sdidebug, the permission to which is necessary for a user to have the capability of debugging stored procedures.

To grant the permission, use the following T-SQL statement: (Remark: before you run this statement, you should make sure that you are using an account which has administrator privileges.)
     
 

    USE master
     GRANT EXECUTE
     ON sp_sdidebug
     TO username