As I previously mentioned, a colleague of mine does not get this error in SoapUI (actually version 5.0.0, not 5.1.x). I am using Ready! API 1.3.1.
Here is the relevant extract from the stack trace:
Caused by: org.xml.sax.SAXParseException; systemId: file:; lineNumber: 1; columnNumber: 1; Unexpected end of file after null
at org.apache.xmlbeans.impl.piccolo.xml.Piccolo.reportFatalError(Piccolo.java:1038)
at org.apache.xmlbeans.impl.piccolo.xml.Piccolo.parse(Piccolo.java:723)
at org.apache.xmlbeans.impl.store.Locale$SaxLoader.load(Locale.java:3454)
I'm reluctant to post the full stack trace and the groovy script because of the information contained in those files about the project where this error occurred. Is the above extract enough for you or (if not) do you have any suggestions about how to get round this problem?