Happens mostly in form-app.
I can correct the error and generate the source, but the app behaves strange and ofter reports errrors that have just been corrected. However much one tries, the problem cannot be solved.
The only remedy: delete the app and start afresh! This is terrribly time consuming! RAD (RapidApplicationDevelopment ) becomes RAE (RapidAngerExtending)
This is in my opinion a basic problem and is responsible for multiplying the time x 100 needed to finish a work.