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[__init__] Provide a better error messages if URLs are missing (Closes #4813)
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@ -361,7 +361,9 @@ def _real_main(argv=None):
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sys.exit()
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ydl.warn_if_short_id(sys.argv[1:] if argv is None else argv)
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parser.error('you must provide at least one URL')
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parser.error(
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'You must provide at least one URL.\n'
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'Type youtube-dl --help to see a list of all options.')
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try:
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if opts.load_info_filename is not None:
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