Try to play another video if that shows 404 error so it means there is some problem in your internet connection. And if the video play so it means the video whcih you want to play before and showing 404 error is removed by the copyright rules violation on you tube.
There are several reason why YouTube error 404 will come, and most of them are caused by missing source required. "YouTube Error 404 Costume not Found" is a response status code, which means a specific HTTP request has not yet been completed. A 404 code indicated the page you wanted to access couldn't be found on the server. To be more specific, every time you want to visit a page via a link, you are telling a server somewhere to send you a page.
For more solutions to this error, you can check the following article for help.
Guide: Fixed - YouTube Error 404 Costume not Found
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