Not found

I’m trying to convert webp, but it just says “Not found”.
(OptimusHQ edition)
When I try to optimize an image, it says “Not found” I have tried three
Optimus says it found 1649 images which can be optimized.
After pressing the “Optimze Images” button, it says for all 1649 images “not found”.

Why am I receiving a “Not Found” error?#
A Not Found error occurs when Optimus cannot find the image in your server’s filesystem. A few common causes of this include:

If an image and ALL of its variations are removed from the filesystem however it still exists in the database, Optimus will return an internal error message. To verify if this is the case, check your Media Library and look for broken images like the following.
broken images media library
Once you’ve identified these images, simply delete them so that they are removed from the WordPress database.

Since WordPress 3.5, the Media Uploader settings have been removed from the WP admin dashboard however are still configurable by defining their path in your wp-config.php file. For example:

define( ‘UPLOADS’, ‘wp-content/’.’files’ );
This would place the uploads directory in wp-content/files rather than the default location wp-content/uploads. Check that you have properly defined your uploads path so that Optimus can properly reference and optimize your images.

Even though I did the above, I can’t.