Facebook Share not working!

I have followed the directions to set up the API, I am assuming I set it up right but i keep getting the error message “Invalid App ID: The provided app ID does not look like a valid app ID.”

I have made sure that the ID and Token are correct!

I do see this sentence at the top of my API page but I don’t understand it!
” Reminder: Graph API v2.6 will be deprecated on Jul 13, 2018. Please use the API Upgrade Tool to understand how this might impact your app. For more details see the changelog”

The page I need help with: [log in to see the link]