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Specified service reference cannot be null.
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java.lang.NullPointerException: Specified service reference cannot be null.	at org.apache.felix.framework.BundleContextImpl.getService(BundleContextImpl.java:401)	at net.java.sip.communicator.plugin.spellcheck.SpellCheckActivator.getUIService(SpellCheckActivator.java:89)	at net.java.sip.communicator.plugin.spellcheck.SpellChecker$1.run(SpellChecker.java:162)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)	at java.awt.EventQueue.access$200(EventQueue.java:103)	at java.awt.EventQueue$3.run(EventQueue.java:694)	at java.awt.EventQueue$3.run(EventQueue.java:692)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)