--- a/csl.api/src/org/netbeans/modules/csl/hints/infrastructure/SelectionHintsTask.java	Tue Sep 15 14:35:42 2009 +0200
+++ a/csl.api/src/org/netbeans/modules/csl/hints/infrastructure/SelectionHintsTask.java	Wed Sep 16 21:29:40 2009 +0100
@@ -94,6 +94,7 @@ 
             Math.max(evt.getMarkOffset(), evt.getCaretOffset())
         };
         if (range == null || range.length != 2 || range[0] == -1 || range[1] == -1 || range[0] == range[1]) {
+            HintsController.setErrors(fileObject, SelectionHintsTask.class.getName(), Collections.<ErrorDescription>emptyList());
             return;
         }