Minify Error

@neotechnomad Where do you exactly get this error, do you see the error in WordPress admin or error log?

In an error log in the public_html/wp-admin directory.

@neotechnomad Can you please try to purge minified files and check if the error goes away?

I neglected to mention that I have never had the minify option activated since installing the plugin years ago.
So, I activated it and reset the cache – which I am assuming is how one purges the files – and I get this error “public_html/wp-content/cache/wpo-minify/1620799098/assets is not a directory!” on the “Minify Staus” tab.
I disabled the minify option again.

Can you please try to set the permissions to 0755 to public_html/wp-content/cache folder and check if it helps to fix the issue?

Permissions is already set to 0755. It was when the plugin was installed.
Error occured 3 times in a row this morning at 05:54, 05:55, and 05:58 as follows:
“PHP Warning: opendir(public_html/wp-content/cache/wpo-minify/1620799098/assets/): failed to open dir: No such file or directory in public_html/wp-content/plugins/wp-optimize/minify/class-wp-optimize-minify-cache-functions.php on line 414”.

@neotechnomad I’ve checked this with our development team, the warning happens because we removed the automatic creation of the cache folder when Minify is not enabled. This is fixed in the development version, so next release shouldn’t have this problem.

Excellent! Consider this thread resolved, then.