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I tried to add a JPanel based class to the palette. See attached screenshot for the error message.
Created attachment 18329 [details] Screenshot
I agree that the "error" message is brief, but it attempts not to overload you with technical details and point you to the correct way to install the Java Bean. The details follow: It can happen that the enclosing project of the form file is configured such that it is not possible to figure out the JAR file the form is compiled to. In such a situation the form file cannot be added into the Palette (using Add to Palette action) because the location of the corresponding class file(s) is not known. On the other hand, you can install the Java Bean through Palette Manager. Go to Tools > Palette Manager. Press Add from JAR ... button. Select the JAR the class is compiled to and finish the rest of the wizard.
ok