There was no attachment in the message. To insert an image into a post, open up the attachments view and hit the green arrow.
I believe though, that what you're looking for is in the
Facebook Developer Area
. Click into your application and go to Settings -> Basic. Set the "Redirect to App/Page" option to 'No' and hopefully that message will go away. If not, post the image you uploaded and, if you know, let us know if the error is about your Application or your Page (I'm assuming Application).
Thanks!
Alex