different gallery problem

I upgraded from 1.3 to 1.4 and trying the image gallery returns the 
following error
Fatal error: Call to a member function on a non-object in 
/var/www/html/sysadminwiki/includes/ImageGallery.php on line 137

the Image list works fine
Aaron
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Aaron Macks             amacks-ddLNuzN6Ww9t1OO0OYaSVA@xxxxxxxxxxxxxxxx
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