# JabRef not opening

**URL:** <https://discourse.jabref.org/t/jabref-not-opening/476>\
**Category:** Help\
**Created:** [February 22, 2017, 9:06pm UTC](https://discourse.jabref.org/t/jabref-not-opening/476 "2017-02-22T21:06:40Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![rolfgroeneveld](https://avatars.discourse-cdn.com/v4/letter/r/4af34b/32.png) [@rolfgroeneveld](https://discourse.jabref.org/u/rolfgroeneveld)\
**Post date:** [February 22, 2017, 9:44pm UTC](https://discourse.jabref.org/t/jabref-not-opening/476/3 "2017-02-22T21:44:12Z")

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Ah! I think I see where the problem might be. I open two files, one in Dropbox, the other in OneDrive for Business. This is what I get:  
WARNING: Could not open/create prefs root node Software\JavaSoft\Prefs at root 0x80000002. Windows RegCreateKeyEx(…) returned error code 5.  
22:38:27.062 [AWT-EventQueue-0] INFO net.sf.jabref.logic.importer.OpenDatabase - Opening: C:\Users\xxx\Dropbox\xxx\litnotes Dropbox.bib  
22:38:27.668 [AWT-EventQueue-0] INFO net.sf.jabref.logic.importer.OpenDatabase - Opening: C:\Users\xxx\xxx\Litnotes OneNote.bib  
22:38:29.245 [AWT-EventQueue-0] ERROR net.sf.jabref.FallbackExceptionHandler - Uncaught exception Occurred in Thread[AWT-EventQueue-0,6,main]  
java.lang.StringIndexOutOfBoundsException: String index out of range: -1  
at java.lang.String.substring(Unknown Source) ~[?:1.8.0\_121]  
at net.sf.jabref.gui.JabRefFrame.updateAllTabTitles(JabRefFrame.java:1664) ~[JabRef-3.8.2.jar:?]  
at net.sf.jabref.gui.JabRefFrame.addTab(JabRefFrame.java:1682) ~[JabRef-3.8.2.jar:?]  
at net.sf.jabref.gui.JabRefFrame.addTab(JabRefFrame.java:1704) ~[JabRef-3.8.2.jar:?]  
at net.sf.jabref.gui.JabRefFrame.addParserResult(JabRefFrame.java:1395) ~[JabRef-3.8.2.jar:?]  
at net.sf.jabref.JabRefGUI.openWindow(JabRefGUI.java:134) ~[JabRef-3.8.2.jar:?]  
at net.sf.jabref.JabRefGUI.(JabRefGUI.java:63) ~[JabRef-3.8.2.jar:?]  
at net.sf.jabref.JabRefMain.lambda$start$1(JabRefMain.java:128) ~[JabRef-3.8.2.jar:?]  
at java.awt.event.InvocationEvent.dispatch(Unknown Source) ~[?:1.8.0\_121]  
at java.awt.EventQueue.dispatchEventImpl(Unknown Source) ~[?:1.8.0\_121]  
at java.awt.EventQueue.access$500(Unknown Source) ~[?:1.8.0\_121]  
at java.awt.EventQueue$3.run(Unknown Source) ~[?:1.8.0\_121]  
at java.awt.EventQueue$3.run(Unknown Source) ~[?:1.8.0\_121]  
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0\_121]  
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) ~[?:1.8.0\_121]  
at java.awt.EventQueue.dispatchEvent(Unknown Source) ~[?:1.8.0\_121]  
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) [?:1.8.0\_121]  
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) [?:1.8.0\_121]  
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) [?:1.8.0\_121]  
at java.awt.EventDispatchThread.pumpEvents(Unknown Source) [?:1.8.0\_121]  
at java.awt.EventDispatchThread.pumpEvents(Unknown Source) [?:1.8.0\_121]  
at java.awt.EventDispatchThread.run(Unknown Source) [?:1.8.0\_121]

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