Problem integrating webplayer in Facebook

I'm having some problems integrating Unity wbplayer into Facebook canvas page. I'm using the heroku provided hosting, but my app doesn't seem to upload properly. After trying herokuy push, I get the following message:

-----> Heroku receiving push ! Heroku push rejected, no Cedar-supported app detected**

To git@heroku.com:"my app".git ! [remote rejected] master -> master (pre-receive hook declined) error: failed to push some refs to "my rep"

Otherwise, heroku is working properly when pushing other files, such as .php, .html... thus I guess it's not related to gemfile as I've read in another post. I'm afraid it must have be a problem related to the .unity3d extension, but if it is... how do other people manage to upload and get their unity3d webplayer app's working on Facebook. Is using your own hosting server the only way or is there anything I'm missing?

Thanx to anyone who may offer any kind of support.