Exception thrown on tools->options->java

java.lang.IllegalArgumentException: #177688: property editor org.openide.explorer.propertysheet.PropUtils$NoPropertyEditorEditor@1e0c4612 for property org.apache.tools.ant.module.AntCustomizer$2[name=properties] does not support a custom editor; valueType=java.util.Properties; PropertyEditorManager says: null; search path is: [sun.beans.editors]; CCL: SystemClassLoader[376 modules]
at org.openide.explorer.propertysheet.CustomEditorDisplayer.setPropertyEditor(CustomEditorDisplayer.java:149)
at org.openide.explorer.propertysheet.CustomEditorDisplayer.getPropertyEditor(CustomEditorDisplayer.java:128)
at org.openide.explorer.propertysheet.CustomEditorDisplayer.getCustomEditor(CustomEditorDisplayer.java:119)
at org.openide.explorer.propertysheet.CustomEditorDisplayer.getComponent(CustomEditorDisplayer.java:352)
at org.openide.explorer.propertysheet.PropertyPanel.installDisplayerComponent(PropertyPanel.java:492)
at org.openide.explorer.propertysheet.PropertyPanel.addNotify(PropertyPanel.java:735)
at java.awt.Container.addNotify(Container.java:2769)
at javax.swing.JComponent.addNotify(JComponent.java:4734)
at java.awt.Container.addNotify(Container.java:2769)
at javax.swing.JComponent.addNotify(JComponent.java:4734)
at java.awt.Container.addNotify(Container.java:2769)
at javax.swing.JComponent.addNotify(JComponent.java:4734)
at java.awt.Container.addNotify(Container.java:2769)
at javax.swing.JComponent.addNotify(JComponent.java:4734)
at java.awt.Container.addNotify(Container.java:2769)
at javax.swing.JComponent.addNotify(JComponent.java:4734)
at java.awt.Container.addImpl(Container.java:1114)
at java.awt.Container.add(Container.java:966)
at org.netbeans.modules.options.OptionsPanel.setCurrentCategory(OptionsPanel.java:185)
at org.netbeans.modules.options.OptionsPanel.access$100(OptionsPanel.java:98)
at org.netbeans.modules.options.OptionsPanel$CategoryButton.mouseReleased(OptionsPanel.java:528)
at java.awt.Component.processMouseEvent(Component.java:6505)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3312)
at java.awt.Component.processEvent(Component.java:6270)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4861)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
at java.awt.Container.dispatchEventImpl(Container.java:2273)
at java.awt.Window.dispatchEventImpl(Window.java:2719)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:694)
at java.awt.EventQueue$3.run(EventQueue.java:692)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:708)
at java.awt.EventQueue$4.run(EventQueue.java:706)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:158)
[catch] at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

Does anyone know how to solve this? i dont think this used to happen.

note: this also happens when clicking the options button on the output window (though i think it brings up the same options screen as tools->options->java… not totally sure cause it throws an exception!)

same problem - no idea how it started happening