Hi
From 1st may 2018 facebook made breaking changes so is various errors appearing, from now on every app owner need to submit his app for review with permissions required along with business verification. This facebook wall module/plugin page access token required manage_pages and user_posts permissions. I am finding correct ways about how this submission goes so that i suggest everyone how to get approved by facebook. Because of huge number of app submission after 1st may, it is taking 1 month to get reply from facebook on app review. So the process will take much time. please wait.
If you are using token of app created before 1st may then that token can still work. In your case i am seeing a error on video field missing. So try not to show video posts from general settings right now. I will correct all these problems in next version soon after I complete work on app review process
So everybody please wait
Thanks