The number appears to be different every time. The error will stop the test. Sometimes, the test will complete, but instead of passing or failing, we get an error message. Most times these keep comingup every other or every 3rd part.Most times we can reset the problem, and at least get rid of the errors for a while, by shutting down the whole system, including the main disconnect. Then powering back up. HELP!! This has been going on too long!!