Installing other plugins with Jmonkey SDK

Hello again, its me. I’ve been trying to install plugins for the jmonkeysdk, but every time I try to install plugins the sdk restarts and then crashes (the jmonkey splash screen shows up and then nothing happens after that). Additionally if I do get the sdk to come various jmonkey features become disabled, such as the scene editor and model viewer. For example I try to install the python/jython plugin for netbeans and the sdk usually crashes after restarting from the plugin installation. Any help will greatly appreciated.

Try deleting the settings folder: