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The form has gridbag layout. There is an NPE during code generation when some properties are changed (e.g. insets). This occurs using "Customize Layout" or using "Properties" for the component. Note: This does not happen if the project is imported in the same session. But it happens if you close Netbeans after having opened the project (without doing changes) and reopen it again.
Created attachment 14271 [details] ide.log
Created attachment 14272 [details] Forms file
The exception looks the same as in issue 35870. *** This issue has been marked as a duplicate of 35870 ***
Verified - duplicate.