Useless Eclipse Error Messages

I had an absolute nightmare the other day with a web services project I was working on in Eclipse (actually Spring STS). I had written a WSDL file and accompanying Schema, and Eclipse was giving me a warning triangle at the very top of the document with the following useless error message:

WS-I: A problem occured while running the WS-I WSDL conformance check:
 org.eclipse.wst.wsi.internal.analyzer.WSIAnalyzerException:
 The conformance validation process failed. 

The only further detail available is:

Nested exception is: 
 java.lang.NullPointerException The WSDLAnalyzer was unable to 
 validate the given WSDL File.

No indication of where there might be an error, or what might be causing the problem. After much removing and replacing of segments of the file, and external validation of the Schema document, my advice to anyone else facing this error is to double, triple and quadruple check the spelling and capitalisation of the name fields in the operations within the definition. Changing a few 'c's to 'C's sorted the issue out for me, but methinks its time for some more informative error messages Eclipse Team!