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repro: install netbeans 6.1 install the XUI plugins (found at xui.sourceforge.net) close netbeans re-open netbeans i get the error: "An incompatible Xalan version has been detected on the IDE's classpath. The IDE cannot start. Please see http://wiki.netbeans.org/wiki/view/FaqXalanOnCP for more information." so i opened up the processLauncher.xml and got rid of the xalan.jar in the classpath and i still have the same issue. i even did a search for xalan on my machine, the only reference i could find to it was ant-xalan.jar, so i trashed that file, still no good.
com-xoetrope-editor.jar contains an embedded copy of Xalan (among dozens of assorted libraries, it seems). Please report a bug for the developers of this module.