We tried to download a file at the specified address, but instead of a video or audio file, we got back something else, like a HTML or XML document. This could be something like a File Not Found error page, but these pages usually come back with a 404 response code (or some other error code), and this error only happens when the HTTP response code was 2XX, indicating that the website thought this was a successful request. So it may be a typo, a bad input URL, or a misconfigured error page.
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