Error CE168

HI i have the error 1568 with the Message "The selected page Massage expects an object of type video, which is not available here".    i have created an association from my main entity to a filedocument entity and want to see the uploaded file in my message detail page but i get this error    thank you so much ahead for your help 
1 answers

See my answer on your other question. You will probably need to remove the incorrect parameters on the page.