Thanks for reporting this – we've passed it along! Some people have mentioned that changing the language to English (US) fixes it, not a long term solution but may help in the meantime. We'll keep you posted!
@TeamYouTube Encountering an error when trying to add my videos to an existing series playlist. Tried unchecking and rechecking the playlist's series option, but got the same error, even without adding anything new. Functioned just fine a few weeks ago. Any solution? @YouTubepic.twitter.com/3rYWAxc2XL
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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