ErrorCode -1 on assertion failure

I'm brand new to SOAP UI so bare with me.  I'm basically testing out the XPath Match assertion on a single return field of an XML file.  I'm running this as a TestRunner.  It seems to detect the expected failure of the assertion, however, it gets to the very end of the report and gives back an alert error of:

"Execution finished with ErrorCode -1"

as well, I get the following lines in that report:

at com.eviware.soapui.tools.SoapUITestCaseRunner.throwFailureException(SoapUITestCaseRunner.java:403)
at com.eviware.soapui.tools.SoapUITestCaseRunner.runRunner(SoapUITestCaseRunner.java:336)
at com.eviware.soapui.tools.AbstractSoapUIRunner.run(AbstractSoapUIRunner.java:128)
at com.eviware.soapui.tools.AbstractSoapUIRunner.runFromCommandLine(AbstractSoapUIRunner.java:72)
at com.eviware.soapui.SoapUIProTestCaseRunner.main(SourceFile:48)


Currently this happens on SOAP UI PRO v 3.0.1 (14 day trial) although it does happen on the free version as well.