New Application - Page Tab - Not showing content?

I've been creating a new application to show a new page tab on our business page. I followed all the steps, I set up the proper URL (iframe) for the page tab. I pushed it to my business page. Everyting seems fine but, no content is shown on the page when I click on the tab. I double-checked the url I set up, and it works fine.

What did I do wrong? I f开发者_运维技巧ollowed that guide http://www.facebook.com/FBML.Codes1?sk=app_217481834936914

But the steps are pretty simple in the end.

Do I miss anything?

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I made it work.

I realised that I set up http instead of https on my app settings and since my facebook was