This means you have communication error between your CAT II / III adapter and the CAT ET Sis software setup. Usually it is a simple fix.
- In the CAT software go to UTILITIES => PREFERENCES => COMMUNICATIONS
- CHOOSE: CATERPILLAR COM ADAPTER II
- CHOOSE under PORTS: COM 7
- Click "OK"
- Restart the computer and usually that is all you need to do.
But if the above steps do not work, then your adapter is setup on a different COM PORT. In which case watch the video below on how to find which com port your CAT II / III (317-7485 or 317-7484) adapter is using and match it with the CAT ET SIS software to fix the CAT #142 error message.