Have you tried these steps: https://goo.gl/bqA3k1 ? Also, let us know if disabling add-ons or using another browser fixes the issue.
@TeamYouTube Why can't I view a list of all my subscriptions anymore? Whenever I click on the word 'Subscriptions' in the sidebar or go to https://www.youtube.com/feed/channels I just get an error message. Tried this on Chrome, Firefox, and Opera using both Windows 10 and macOS Sierrapic.twitter.com/YWxzG31RN3
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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