Hello Visan,

You should select website platform as your page is a website.

You can also use the below step-by-steps as guide to fix your Facebook:-
1. Edit your Facebook application. Screenshot: http://screencast.com/t/rrPvWRXWf .
2. Check Site URL, App Domain make sure they are the same as your site domain (http://www.yoursite.com and http://yoursite.com make a big difference) Screenshot: http://screencast.com/t/1t4iS5775Jm , http://screencast.com/t/HQ3AYWavzo and http://screencast.com/t/hSCFSduqf5 .
3. If you already setup EasyBlog for autoposting, go to the EasyBlog -> Autoposting -> Advanced Settings page and revoke the access. If not yet setup, you need to setup these fields:

Enable autoposting for Facebook = Yes.
App ID = Facebook app id
App Secret = Facebook app secret
Post as your Facebook page = Yes [if you're using this app for Facebook Page]
Page ID = Facebook page id

4. Authenticate the Facebook Access.

If you're having problem, can you provide us with backend access and your Facebook access so that we can help you fix this issue. Actually we need this access in order to have a better view and understanding, debug and fix your issue much quicker.

Hope this help and please be advised.
Thanks.