Can't run CheckStyle [SEC=UNCLASSIFIED]

Hi guys,
 
I can no longer run Checkstyle under Eclipse.
I get the error: 
 
.....\.metadata\.plugins\net.sf.eclipsecs.core\internal_config__12041618
33550.xml (The system cannot find the file specified)
 
I do have this file but it is in:
 
....\.metadata\.plugins\com.atlasww.tools.eclipse.checkstyle
 
But if I copy this file into net.sf.eclipsecs.core, then I get an error:
 
"Cannot initialize module TreeWalker - TreeWalker is not allowed as a
parent of FileLength"
 
How can I get CheckStyle to work again?
 
Cheers
Russell Thamm

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