Thumnails not generating

My server hosts FFMPEG at

/usr/bin/ffmpeg

The plugin doesn’t necessarily use FFMPEG to generate thumbnails. By default it uses the browser’s built-in video decoding capabilities. Do you have the same problem with every video? Can you post a link to a video that’s giving you trouble?

I realized that I should have activated for the network as I am using a multisite install – I was then able to install FFMPEG properly – thumbnails are now being generated but I’m getting this error

Warning: Invalid argument supplied for foreach() in /home/learnio0/public_html/wp-content/plugins/video-embed-thumbnail-generator/video-embed-thumbnail-generator.php on line 427

Warning: Cannot modify header information – headers already sent by (output started at /home/learnio0/public_html/wp-content/plugins/video-embed-thumbnail-generator/video-embed-thumbnail-generator.php:427) in /home/learnio0/public_html/wp-includes/pluggable.php on line 1121

This error is generating from
https://familytest.learninghood.ca/wp-admin/options.php

when I try to make changes

Above error comes when I make changes and then try to save. The saves, however, do seem to be taking effect.

Something’s happening with your user roles and capabilities. Do you use a plugin to manage your user roles? Can you post a screenshot of the bottom part of my plugin’s settings page? The part that includes user capabilities.