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

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java.lang.NullPointerException:
at org.eclipse.jdt.internal.core.search.IndexSelector.getQualifiedNames(IndexSelector.java:308)
at org.eclipse.jdt.internal.core.search.IndexSelector.initializeIndexLocations(IndexSelector.java:208)
at org.eclipse.jdt.internal.core.search.IndexSelector.getIndexLocations(IndexSelector.java:276)
at org.eclipse.jdt.internal.core.search.JavaSearchParticipant.selectIndexes(JavaSearchParticipant.java:107)
at org.eclipse.jdt.internal.core.search.PatternSearchJob.getIndexes(PatternSearchJob.java:79)
at org.eclipse.jdt.internal.core.search.PatternSearchJob.ensureReadyToRun(PatternSearchJob.java:50)
at org.eclipse.jdt.internal.core.search.processing.JobManager.performConcurrentJob(JobManager.java:174)
at org.eclipse.jdt.internal.core.search.BasicSearchEngine.findMatches(BasicSearchEngine.java:214)
at org.eclipse.jdt.internal.core.search.BasicSearchEngine.search(BasicSearchEngine.java:515)
at org.eclipse.jdt.internal.corext.refactoring.RefactoringSearchEngine2.searchPattern(RefactoringSearchEngine2.java:484)
at org.eclipse.jdt.internal.corext.refactoring.structure.MemberVisibilityAdjustor.adjustVisibility(MemberVisibilityAdjustor.java:747)
at org.eclipse.jdt.internal.corext.refactoring.structure.PullUpRefactoringProcessor.createChangeManager(PullUpRefactoringProcessor.java:1140)
at org.eclipse.ltk.core.refactoring.participants.ProcessorBasedRefactoring.checkFinalConditions(ProcessorBasedRefactoring.java:237)
at org.eclipse.ltk.core.refactoring.CheckConditionsOperation.run(CheckConditionsOperation.java:85)

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