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Null pointer when setting a project's properties.
Created attachment 18674 [details] NetBeans log file
java.lang.NullPointerException: org.netbeans.modules.java.ui.nodes.elements.SourceChildren.setElement(SourceChildren.java:248) org.netbeans.modules.java.JavaNode$JavaSourceChildren.setElement(JavaNode.java:171) org.netbeans.modules.java.JavaNode$JavaSourceChildren.addNotify(JavaNode.java:152) ...
This was fixed some time ago.