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If the jsp parser finish with an exception, then the message, which is displayed in the editor status bar is not describing the root of the problem and it's misleading. This issue should be an umbrella for such things.
See the issue 115912, where is described one use case.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss