Are you testing locally or on a server?
Also, what's mochibot.com and what are you loading from there?
General notice: from now on, I would like to ask everyone to put [AS2] or [AS3] (corresponding to the version of actionscript you are using on your project) in front of their post titles when the question is actionscript related! Please help us help you faster. Thank you.
I'm testing locally. I'm not sure what mochibot.com is or what it has to do with the error? The swf I'm trying to load is from a photo gallery and it's just a demo version so I'm not sure if that has anything to do with it, but that doesn't seem like it should effect it? I know it's possible to load swf's in empty MC's I just don't know why it's not working in this situation?