c is not a constructor   I definitely can not understand what causes this damn error. Everything working normally, you updated the version and things that were working normally start to give problems. This has been a constant struggle.     What does the core try to do that occurs? There has to be a message, something more friendly so we can understand and find the problem.   I have an ERP operating on more than 300 100% unigui customers today. I can not stay with the