Warning: imagejpeg()

Im getting this after a fresh install, granted its not all the time but its random after opening dome images then closing them.


Warning: imagejpeg()[function.imagejpeg]: Unable to open '/var/www/vhosts/mysite.com/httpdocs/image/cache/catalog/Footwear/classic oxfordK7000-47x47.JPG' for writing: Permission denied in /var/www/vhosts/mysite.com/httpdocs/system/library/image.php on line 45

please help

Does it have anything to do with a space in the image name? Just guessing.

classic oxfordK7000-47x47.JPG