Using oracle form builder, I get this error from time to time when compiling a form. It is said to be because of several forms being open at the same time. So if you get this error, better to close some forms and they try again.
However, I have solved the problem another way. I have one of my forms open in pll format, which was causing the problem. I have closed that form, opened it in fmb or fmx format and then no errors.
Resource:
However, I have solved the problem another way. I have one of my forms open in pll format, which was causing the problem. I have closed that form, opened it in fmb or fmx format and then no errors.
Resource: