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Exception occurred creating launch configuration tabs Reason: Plug-in org.eclipse.ui.externaltools was unable to load class org.eclipse.ui.externaltools.internal.ant.launchConfigurations.AntTabGroup It looks like the org.eclipse.ui.externaltools.internal.ant tree is missing. It used to be in org.eclipse.ui.externaltools_2.1.0\externaltools.jar.
Fixed in I20030610 drop.