Error trying to create report (" Class not set for parameter : TestSuiteCoverage" )

Using Ready! API 1.3.1 (had same issue with 1.2.x).

I often get the following error when I try to generate a report after running a TestSuite:

ERROR:net.sf.jasperreports.engine.design.JRValidationException: Report design not valid :
  1. Class not set for parameter : TestSuiteCoverage

A temp workaround that I found is to run a TestCase, generate a report and then go back to the TestSuite (no need to re-run it) and generate the report. I would like to know if there is a more permanent workaround/fix.  Doing this every session is tedious.

I searched forum and see there are multiple reports of this including this one that has a link to a possible 'solution' but the link just takes me to the old forum homepage, not to the particular post:

http://community.smartbear.com/t5/SoapUI-NG/JRValidationException-Report-design-not-valid/m-p/32657/highlight/true#M15937

Would be nice to have this fixed or at least investigated since it seems to effect quite a few users.

Regards,

Greg