My guess is that you made a typo, probably an intentional one.
Ex. For say, reading Green's tutorial you see that where ~presumably threre would be spaces there are underscores (as in " _ ") , thinking like that one might copy paste the correct path and then replace the spaces with underscores, resulting in a stupid path. (green's file actually had underscores) Tring to open the resulting file will result in the exact error messege you described.
Thats just one simple scenario..
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