Hello, I'm newbie in Jitsi. I try to use apache poi packages in my Jitsi
project, but after compiling, I run the program,(my custom button works as
well) if I choose my .ppt file I got this output, before the "XMLSlideShow
ppt = new XMLSlideShow(OPCPackage.open(chosenFile));" line : SEVERE: 
util.UtilActivator.uncaughtException().108 An uncaught exception occurred
in thread=Thread[AWT-EventQueue-0,6,main] and message was:
So my question is how can I add this apache-poi library to jitsi library? I
add it by using eclipse: eclipse->project preferences->libraries.
I put my code into CallPanel.java its only an ActionListener and 2 methods,
which want to use org.apache.poi libraries.