Same for me (upgraded to 4.5.2 same issue)
Fri May 24 12:42:32 CEST 2013:ERROR:net.sf.jasperreports.engine.design.JRValidationException: Report design not valid :
1. Class not set for parameter : TestCaseCoverage
net.sf.jasperreports.engine.design.JRValidationException: Report design not valid :
1. Class not set for parameter : TestCaseCoverage
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.createReport(SourceFile:460)
at com.eviware.soapui.reporting.engine.jasper.GenerateJasperReport$ReportFillWorker.construct(SourceFile:428)
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(Unknown Source)
