From the Error Codes Chart in the F8025M Users (Programming) Manual it says:
016 - The called subroutine or block does not exist or the block searched by means of special function F17 does not exist.
Get a copy of the F8025M Users Manual Here. Look at PDF pages 357-358 of 423 where it talks about defining a subroutine and how to call a subroutine.
My guess is that the program that you are drip feeding to the machine is calling a subroutine that is not loaded into the CNC. So, it stops.
Hope that helps point you in the right direction.