Rewrote error message a bit to clarify

youtube_dl/utils.py

@@ -474,7 +474,7 @@ class ExtractorError(Exception):
         """ tb, if given, is the original traceback (so that it can be printed out). """
 
         if not sys.exc_info()[0] in (compat_urllib_error.URLError, socket.timeout, UnavailableVideoError):
-            msg = msg + u'; please report this issue on http://yt-dl.org/bug with the complete output by running the same command with --verbose flag'
+            msg = msg + u'; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output.'
         super(ExtractorError, self).__init__(msg)
 
         self.traceback = tb