Venkman internal error

"Guus Ellenkamp" <[email protected]>
Newsgroups gmane.comp.mozilla.devel.jsdebugger
Organization Another Netscape Collabra Server User
Message-ID <[email protected]>
I'm new to Mozilla/Venkman, but managed to install it now. I get the 
following error:

!! Internal error dispatching command "watch-expr"
!! ReferenceError: treeView is not defined @ 
<chrome://venkman/content/venkman-views.js> 127
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