ArrayIndexOutOfBoundsException for sample project war

Hi, exporting the sample project hangs forever in 'Progress - creating war file' activity indicator dialog.

13:27:57,225 INFO [SoapUI] Used java version: 1.6.0_34
LoadPlugin: failed to initialize shared library libXt.so [libXt.so: cannot open shared object file: No such file or directory]
LoadPlugin: failed to initialize shared library libXext.so [libXext.so: cannot open shared object file: No such file or directory]
LoadPlugin: failed to initialize shared library /usr/lib/mozilla/plugins/nppdf.so [/usr/lib/mozilla/plugins/nppdf.so: wrong ELF class: ELFCLASS32]
13:28:22,237 INFO [WsdlProject] Saved project [Sample Project] to [/home/thomas/development/soapui-4.5.1/Tutorials/sample-soapui-project.xml - 127301 bytes
13:28:22,244 INFO [MockAsWar] Creating WAR directory in [/opt/apache-tomcat-6.0.36/webapps]
13:28:22,246 ERROR [JarPackager] /home/thomas/development/soapui-4.5.1/../lib or /opt/apache-tomcat-6.0.36/webapps/WEB-INF/lib is not directory!
Exception in thread "SwingWorker" java.lang.ArrayIndexOutOfBoundsException: 0
at com.eviware.soapui.tools.MockAsWar.prepareWarFile(MockAsWar.java:225)
at com.eviware.soapui.tools.MockAsWar$1.construct(MockAsWar.java:90)
at com.eviware.soapui.support.swing.SwingWorkerDelegator.construct(SwingWorkerDelegator.java:46)
at com.eviware.soapui.support.swing.SwingWorker$2.run(SwingWorker.java:149)
at java.lang.Thread.run(Thread.java:662)

This is the deploy as war function on the default Sample Project. Any ideas?