Why this is appering: Given URL is not permitted by the application configuration

[meej]

Lately, I noticed an error appearing in some of the threads in my forums.

This is what the error says:
"Given URL is not permitted by the application configuration.: One or more of the given URLs is not allowed by the application configuration. It must match one of the Connect or canvas URLs or the domain must be the same as or a subdomain of one of the application's base domains."

A screen shot of the error is attahced

At the beginning, I thought the error is from one of the products so I disabled them, but that did not help.
I would appreciate it if you have any ideas of how to fix this issue.

This is a live example:
http://www.syriaparadise.com/vb/show...?t=4632&page=2