"Unfortunately, a Serious Error Has Occurred..." help please

java.lang.NullPointerException
 at org.opencdisc.validator.settings.Template.matches(Template.java:271)
 at org.opencdisc.validator.settings.ConfigurationManager.prepare(ConfigurationManager.java:194)
 at org.opencdisc.validator.DefaultValidator.validate(DefaultValidator.java:298)
 at org.opencdisc.validator.gui.ValidatorClient$ProcessMonitor.run(ValidatorClient.java:1634)

Settings are...

Validate data

SDTM

SAS Transport XPORT

sourece data: a directory that contains XPT files and the define.xml

configuration: config-sdtm-3.1.2.xml  (the default, no changes have been made)

Define.xml: pointed at the define.xml that is in the same directory as the XPT files

Report Format: excel (no changes made to report settings)