java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.springframework.ide.eclipse.web.flow.ui.model.ConfigSetNode.setBeansConfigSet(ConfigSetNode.java:197)
at org.springframework.ide.eclipse.web.flow.ui.properties.ConfigSetDialog.buttonPressed(ConfigSetDialog.java:248)

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