Wordpress Image upload error

Hey guys i need help with my image problem. I started getting image errors when i installed an addon domain on my account and later deleted the addon domain. Every image i try to upload fails. I have read lots of article on this. I have change the folder directory to permissions in my wordpress upload folders to 755 and the files to 644. yet it didn't solve the problem.

So I am looking for any solution in here or to hire an expert that can fixed this problem.