Swf won't load?

When I press the button to load one of my external swfs. There is no error I just get this message in the OUTPUT:

Error opening URL “…”

Does anyone know a reason for this or a solution?

This seems like it might be a problem with the external swf movie? It is a large file 7.1 MBs, but on it’s own it plays and works fine.

I am stumped? :puzzle: