System.Data.SqlClient.SqlException: 'Procedure or function 'STDMST_INSERT' expects parameter '@SID', which was not supplied.'

Question

 USE [AttSystem]
 GO
 /****** Object:  StoredProcedure [dbo].[STDMST_INSERT]    Script Date: 20/12/2020 17:37:22 ******/

 SET ANSI_NULLS ON
 GO
 SET QUOTED_IDENTIFI