Why can't I set a Watch?

"7stud" <[email protected]>
Newsgroups gmane.comp.mozilla.devel.jsdebugger
Message-ID <[email protected]> 
The way I set a Watch is by loading the page into FF1.0, launching Venkman,
reloading the page, setting the page as the Evaluation object, then right
clicking on the Watch pane, and clicking on Add Watch Expression.  Then I
type in the variable name without quotes into the dialog.

Sometimes that works, and sometimes, I get this error::

Internal error dispatching command 'watch-expr".
Reference Error: treeView is not defined @<
chrome://venkman/content/venkman-views.js>123

Can anyone tell me what I am doing wrong?
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