“failed to open stream” error

Hi there! I am getting the follow error messages when I update my social icons color:
sitename/wp-content/plugins/super-socializer/css/share-default-svg-horizontal.css): failed to open stream: HTTP request failed! HTTP/1.1 401 Unauthorized in /home/customer/www/sitename/public_html/wp-content/plugins/super-socializer/helper.php on line 257
and
sitename/wp-content/plugins/super-socializer/css/share-hover-svg-horizontal.css): failed to open stream: HTTP request failed! HTTP/1.1 401 Unauthorized in /home/customer/www/sitename/public_html/wp-content/plugins/super-socializer/helper.php on line 257

I deactivated all other plugins, and reverted to the 2021 theme, but the error is still there. I’m running the latest version of WP, and the latest version of your plugin. I’ve cleared my caches, and none of my css files are minified. I have also tried the steps outlined in this link. This is a staging iteration of my site, but I haven’t had issues with this plugin when I had other sites in staging.

Any thoughts? Thanks so much!