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I made a simple GUI frondend according a tutorial from the official Netbeans site (I am very beginner with java). I discovered that every time I change literally anytything to the project e.g. resize the JFrame window and then --> build the project again the error occurs. I will try to enclose the project in a zip file.
Created attachment 41851 [details] Exception details, the log file, the project folder itself
The attached form is corrupted - a result of a known bug in 5.0 (already fixed in 5.5). 6.0 corrects the form automatically, so it opens without problem, but still can't add a new textfield at the unoccupied position in the upper panel - exception. This should be investigated and fixed.
The form can be opened/modified by now. The exception mentioned by tpavek is covered by issue 82264.