NWDS init error

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when i opened the NWDS 7.1, "web dynpro explorer"tab showed an error:

java.lang.NoClassDefFoundError: com/sap/ide/massconfig/editor/tree/provider/TreeLabelProviderMcNavigator

at com.sap.ide.es.config.mc.facade.MassConfigurationServiceFactory.createMassConfigurationConnectivityNodeService(MassConfigurationServiceFactory.java:53)

at com.sap.ide.webdynpro.connectivitynode.adapter.tree.ConnectivityNodeContentProvider.getMcContentProvider(ConnectivityNodeContentProvider.java:75)

at com.sap.ide.webdynpro.connectivitynode.adapter.tree.ConnectivityNodeContentProvider.getElements(ConnectivityNodeContentProvider.java:53)

at com.sap.ide.tools.core.viewerfwk.ui.tree.CompoundContentProvider.getElements(CompoundContentProvider.java:118)

at org.eclipse.jface.viewers.StructuredViewer.getRawChildren(StructuredViewer.java:937)

at org.eclipse.jface.viewers.ColumnViewer.getRawChildren(ColumnViewer.java:693)

at org.eclipse.jface.viewers.AbstractTreeViewer.getRawChildren(AbstractTreeViewer.java:1298)

.......

so i cannot go on my coding.

My NWDS ran well in the morning, but down suddenly.

any suggestion? thanks a million.

Yu