Need Help Matsuura mc500 with pnc 500 indexer

[antatps3]

Hello Thanks for taking the time to read this. I have a Matsuura mc 500vs with a pnc-500 indexer. This was hook up to the machine at one time the customer lent us the indexer to do his parts. Then we got his machine too now I run a haas and prototracs. Im a little lost I just loaded the tape and check the Program and they use a m21 to send the signal to the indexer but when I try to run the program it stops on that line. So next I tryed to do it in MDI and JOG by putting in the m21 code and pressing cycle start but I get a m-finn, I tryed to change the paramaters in the pnc 500 but By what I read the indexer is set up correct. Any input would be great, Thanks Anthony