Installed RescueTime and Mac can't restart

So I installed RescueTime, played around with it and really like it. Then went to restart my macbook and no go. Stuck on the grey screen with the spinning gear.

Is this a common issue? If so a heads up on the solution would be great otherise I just consider it bad luck and nothing to do with RescueTime.

Thanks,
Greg
 
sad I’m frustrated
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