Or….
Update that database entry.
'376', 'facebook_application', 'a:2:{s:6:\"app_id\";s:XXXX:\"YOUR APP ID\";s:10:\"app_secret\";s:YYYY:\"YOUR SECRET\";}', 'yes'
XXXX= the length of your app ID (mine was 15)
YYYY= the length of your app secret (mine was 32)