Upgraded 1.8.4 to 1.9 and site is down.

Getting this error file_get_contents(/home/wellgroo/public_html/wgl/_cache/_app/content/content.php): failed to open stream: Permission denied. Found a few other threads about fixing this and similar issues and nothing fixes the problem. Help, you can visit my site at www.wellgroomedlake.com/wgl to see the issue in action.

>>>>>>> Unanswered <<<<<<<
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