A few checks:

This is a common problem on new controller start ups. Check your bits on CS8. Command BITD
If you are using a brake switch, you must have your brake switch bits in status word 8 set properly depending of your brake switch is normally open or normally closed.

As a check you can set cs8 to 8hex and see if the problem goes away. Type cs8=8h then WRT to save it.
This effectively makes the system ignore a brake switch.

Also make sure your rope gripper is not causing problems if you have one. Some of the jobs around the early 2000's had not incorporated all the now redundant checks that CEC provides around the rope gripper circuit. GTS module must be active for you to run. You should get different errors on newer jobs.