[RESOLVED] facebook app.. x-frame-options DENY?

i'm trying to write an application for facebook, this will be my first app. i get the following error in the javascript console when trying to open the app through facebook within the iframe.

Code:

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Refused to display 'URL HERE' in a frame because it set 'X-Frame-Options' to 'DENY'.

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if i open the app outside of facebook, it works fine. how would i go about fixing this? any suggestions? i've tried to search on google, but nothing of what i found has worked so far.

i'm not certain what information you guys need to help me here, so please ask.

edit:

after trying to fix this for 14 hours I've managed to get it working, I don't know how its even working since i use the same code as I started out with.. lol