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I repeatedly pressed alt-enter in frustration while my laptop was sounding like a jet on the runway and the add import hint would not come up because some background thread was going insane. On the third try, the following exception was thrown: java.lang.AssertionError: Start offset must be before the end offset. startOffset = 675, endOffset = 674 at org.netbeans.spi.editor.highlighting.support.OffsetsBag.addHighlightImpl(OffsetsBag.java:452) at org.netbeans.spi.editor.highlighting.support.OffsetsBag.addHighlight(OffsetsBag.java:137) at org.netbeans.modules.editor.hints.AnnotationHolder.computeHighlights(AnnotationHolder.java:694) at org.netbeans.modules.editor.hints.AnnotationHolder.updateHighlightsOnLine(AnnotationHolder.java:642) at org.netbeans.modules.editor.hints.AnnotationHolder.updateHighlightsOnLine(AnnotationHolder.java:629) at org.netbeans.modules.editor.hints.AnnotationHolder.setErrorDescriptionsImpl(AnnotationHolder.java:808) at org.netbeans.modules.editor.hints.AnnotationHolder.access$1100(AnnotationHolder.java:83) at org.netbeans.modules.editor.hints.AnnotationHolder$4.run(AnnotationHolder.java:721) at org.netbeans.editor.BaseDocument.render(BaseDocument.java:1162) at org.netbeans.modules.editor.hints.AnnotationHolder.setErrorDescriptions(AnnotationHolder.java:718) at org.netbeans.modules.editor.hints.HintsControllerImpl.setErrorsImpl(HintsControllerImpl.java:103) at org.netbeans.modules.editor.hints.HintsControllerImpl.setErrors(HintsControllerImpl.java:85) at org.netbeans.spi.editor.hints.HintsController$1.run(HintsController.java:51) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:539) [catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:964)
*** This issue has been marked as a duplicate of 112566 ***