Super dev mode fail to work with error on recompile

Hello, I'm getting this error on eclipse after pressing the "Dev Mode On" bookmarklet:

__gwt_getProperty([string: 'user.agent']): Property 'user.agent' of object  is not a function

and then my app stops working.

Full question details here:

http://stackoverflow.com/questions/11591836/how-to-run-gwts-super-dev-sourcemaps-using-the-showcase-sample

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