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

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java.lang.NullPointerException:
at net.sf.jabref.BasePanel.addContentSelectorValuesToAutoCompleters(BasePanel.java:2099)
at net.sf.jabref.BasePanel.instantiateAutoCompleters(BasePanel.java:2089)
at net.sf.jabref.BasePanel.setupMainPanel(BasePanel.java:2043)
at net.sf.jabref.BasePanel.init(BasePanel.java:264)

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