Problems creating Project Reports

Hi,

I am trialing SOAPUI 3.6.1 PRO in regards to the report functionality.
However I get stuck on the Project Reports the whole time. I have a project with 2 testsuites. Whenever I want to create the Project Report I get the following error:

2011-04-05 16:01:00,843 ERROR [errorlog] net.sf.jasperreports.engine.design.JRValidationException: Report design not valid :
1. Class not set for parameter : ProjectCoverage
net.sf.jasperreports.engine.design.JRValidationException: Report design not valid :
1. Class not set for parameter : ProjectCoverage
at net.sf.jasperreports.engine.design.JRAbstractCompiler.verifyDesign(JRAbstractCompiler.java:258)
at net.sf.jasperreports.engine.design.JRAbstractCompiler.compileReport(JRAbstractCompiler.java:140)
at net.sf.jasperreports.engine.JasperCompileManager.compileReport(JasperCompileManager.java:215)
at com.eviware.soapui.reporting.engine.jasper.GenerateJasperReport.a(SourceFile:606)
at com.eviware.soapui.reporting.engine.jasper.GenerateJasperReport.createReport(SourceFile:459)
at com.eviware.soapui.reporting.engine.jasper.GenerateJasperReport$ReportFillWorker.construct(SourceFile:427)
at com.eviware.soapui.support.swing.SwingWorkerDelegator.construct(SwingWorkerDelegator.java:46)
at com.eviware.soapui.support.swing.SwingWorker$2.run(SwingWorker.java:140)
at java.lang.Thread.run(Unknown Source)

This is quite blocking for my eveluation. Is there any workaround for this?
I already deselcted the "Auto prepare" option under Coverage Settings in my project.

Thank you in advance.