It turns out that I was working on a Java project in the IDE netbeans 8.2, my PC is a bit bad .... and at times, being forced for too long or a long time it freezes and you have to turn it off, then I gave it to save while I was working on a form and I click and the pc that freezes ... do not alter me because it is not something that I miss the freeze then turn it off, now ... when I restart it after a while and abri netbeans .... the form I was working on was completely empty, and the graphical interface part says "The form could not be opened" and it was a form that had around ... 2000 programmed lines, subtracting everything that adds netbeans ... please, does anyone know how to recover it?