When I start typing the name of a class, and then hit "ctr-space" to bring up content assist, I am getting an error "Content Assist" did not complete normally.  Please see the log for more information.

The stacktrace is :

java.lang.StringIndexOutOfBoundsException: String index out of range: -1at java.lang.String.substring(Unknown Source)at com.salesforce.ide.ui.editors.apex.assistance.proposals.ClassIntfEnumProposal.construct(ClassIntfEnumProposal.java:83)at com.salesforce.ide.ui.editors.apex.assistance.proposals.ProposalAggregator.construct(ProposalAggregator.java:171)at com.salesforce.ide.ui.editors.apex.assistance.proposals.ApexCompletionProposalDelegate.construct(ApexCompletionProposalDelegate.java:88)at com.salesforce.ide.ui.editors.apex.assistance.ApexCompletionProcessor.computeCompletionProposals(ApexCompletionProcessor.java:93)at org.eclipse.jface.text.contentassist.ContentAssistant.computeCompletionProposals(ContentAssistant.java:1832)at org.eclipse.jface.text.contentassist.CompletionProposalPopup.computeProposals(CompletionProposalPopup.java:556)at org.eclipse.jface.text.contentassist.CompletionProposalPopup.access$16(CompletionProposalPopup.java:553)at org.eclipse.jface.text.contentassist.CompletionProposalPopup$2.run(CompletionProposalPopup.java:488)at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)