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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)