The error that I can see is :
Given URL is not permitted by the application configuration.: One or more of the given URLs is not allowed by the App's settings. It must match the Website URL or Canvas URL, or the domain must be a subdomain of one of the App's domains.
The configurations steps you should follow are :
On the Facebook app dashboard :
- in the "App Domains" field put : comule.com
- in the "Website with Facebook login" section, in the "Site URL" field put :
This value must be equal to the value in the "Preferred site URL" field on q2a (admin panel settings). In this case the "Preferred site URL" of your site should be also:
In the "Display Name", "Namespace", "Contact email", put the values you want.
Disable Sandbox mode.
- you do not need to fill the other sections ("App on Facebook" and "Mobile Web")
Take the Facebook "App-id" and "App-Secret" values and put them in the facebook plugin Admin panel options.
Check that you have followed exactly all the steps (and in particular check your "Preferred Site URL" value)