Invalid feed rate is mainly a Growth Series script issue. This can be resolved by either updating the VMD software or calling into support and having a tech change the back end for you.
talked to tech support, I still get it the error that is , but not often. and now I can get back to where the problem occurred, and restart. did not change the back end . I was not adding a feed rate to my part, now a true 100 relates to 100 ipm if you know what I mean
The backend isn't always defining the default feedrate causing the error to be displayed. There's 2 opinions, 1 saying run with a default feed if undefined and another stop and report an error. The probability of default feed being correct is close to nil, therefore why bother and just display an error however those in the default camp say the operator will scale to suit. Define the feed within the NC file and the error will not be reported.
