Facebook feed error #100

Hi, after installing the plugin and plugging my facebook account, the page shows me ‘# 100 error’.
All settings in ‘facebook developer’ and in posts are set as public. Can anyone help me?
What is wrong?
In order to fix the error, I was acting in accordance with the instructions at https://www.slickremix.com/docs/facebook-error-m… , but it also failed.
https://tinyurl.com/y87dj8fp