error.....Procedure or function sp_register has too many

Question

error 

Procedure or function sp_register has too many arguments specified.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.Data.SqlClient.SqlException: Procedure or function sp_register has too many arguments specified.

Source Error: 

Line 38: paramout.Direction = ParameterDirection.Output; Line 39: objCmd.Parameters.Add(paramout); Line 40: objCmd.ExecuteNonQuery(); Line 41: string outmsg = paramout.SqlValue.ToString(); Line 42: return outmsg;