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I’m hmm. It looks great, I just don't know how to make it work.

TypeError:COLLAPSIBLE_SIDEBOXES.center is undefined.

Hi there. I have Firefox 7 and some of the Gmail labs installed. When I activated IG I received this message: TypeError:COLLAPSIBLE_SIDEBOXES.center is undefined. Then the screen turns gray and Firefox stays that way. I have to restart and each time I log on to Gmail I get the same error. Could you help me? I am using Windows Vista. Thank you!
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