Having a problem with facebook connect- musicity 1.7

hi i have done all that i got to do to configurate facebook connect: I made a app in facebook, put the respective Facebook API Key and Facebook Application Secret. But it doesn't work. i am using musicity 1.7 and jomsocial 2.2.3 and i have the same error that is in the demo template of 1.7 when i try to login it says "An error occurred, please try again later."

I have to do something special with the template or the same as any other?

please help, thanks.