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steps to reproduce in dev 201304182301 1. make sure your module in nb.org doesn't depend on swinglayout. (a module wrapping the swing lib) 2. create new JPanel 3. Observe error. project.xml now contains the dependency on swinglayout. My Tools/Options/Java/GUI Builder settings are default, saying "Layout generation style" = "Automatic"
*** This bug has been marked as a duplicate of bug 213230 ***