There can be multiple reasons that you are getting a "YouTube Error 404 Costume not Found" issue. One of them is content removed
This is the most often seen reason that triggers the "YouTube Error 404 Costume not Found." The page you want to access or content you want to visit has been deleted from YouTube, yet the internet links haven't been adjusted accordingly.
For more possible causes and solutions to this error, you can check the following article for help.
Guide: Fixed - YouTube Error 404 Costume not Found
Here is a guide about 404 error messages in general:
Getting 404 Not Found Error Here What to Do
Here is a YouTube video about 404 Error Messages:
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