Thank you for bringing this to our attention. I am checking with my colleagues to get more details on this. I’ll get back to you as soon as I have an update; thank you in advance for your patience. If you have any additional thoughts or questions in the meantime, please let me know.
We couldn”t find any reference to the sb-youtube-free.min.css file in the current version of the YouTube Feed plugin. And we could not trigger the error.
The file name was changed to sb-youtube.min.css in a previous version of the plugin so it is likely the error is being caused by caching or a CDN referring to the previous version of the file. If you have already updated to the latest version of the YouTube Feed plugin you can use the workaround below:
The current plugin version is 2.2.3, and the last update was released two months ago. This is not related to caching or a CDN issue; the file appears to be missing.
Could this be due to running the free version of the plugin?