The referrer null does not match the referrer restrictions configured on your API key.

Solution

In some cases, you may get this (grammatically incorrect) message;

Error. YouTube API request failed: The referrer null does not match does not match the referrer restrictions configured on your API key. Please use the API Console to update your key restrictions...

Nobody is sure why it appears, but in this case, please feel free to use this API key:

AIzaSyCRhssmgl7mDtPKRCRW9-6Redt7gMviNIs

 

 

 
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