Auto Thumb

I have recently installed auto Thumb plugin used it on a site recently with custom fields with some code supplied from this site and it worked just great.

http://wordpress.org/extend/plugins/autothumb/

Am having trouble with it on this site however:

http://174.120.240.6/~marketin/

Half way down page I am getting an error message related to file path..Advice much appreciated.

Here is the path I am getting …

“http://174.120.240.6/~marketin/wp-content/plugins/autothumb/image.php?src=/~marketin/wp-content/uploads/2010/02/campaign_x1.gif&aoe=1&q=100&w=147&h=49&hash=82b4073f102d35be166d2bc0a3602ab3

I contacted webhost and they told me to modify path in post area which is not ideal..There must be a way to modify plugin files to make this work?