The error message is pretty explicit:
Procedure or function 'ADM_GROUPInsert' expects parameter '@GROUP_ID', which was not supplied.
The problem is not in your code as shown - it has to do with how you call the procedure. When you do, you have not supplied the parameter!
We cannot help you to sort this by looking at the procedure - it needs a parameter supplied to work. Look at the code with which you call it!