If you're missing the call-to-action buttons inside the campaign, you have likely missed a step in the setup. We have outlined some possible issues below that would cause this error to take place.
# 1 Check your settings in the Application - If you missed the FBLogin settings, this will be the first thing to cause this error. The image below shows you where to enter the domain details. YOU NEED TO HAVE THE VALID OAUTH REDIRECT URIs.
Valid OAuth redirect URIs
If that button is red, click it - simple fix.