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A303 This happens cause you either added the source URL to the "Manual Userscript and @require Blacklist" or it was added to the list maintained by me. You can find the list including the reason for blackisting at the GitHub repo.
If you still want the script to run then you can either increase the "Severity Level" or disable the remote list this way:
Note: If you're a script author and think I made a mistake, then just send me an email or open an issue at GitHub.