HTTP Error 420

I am getting this error message and a general “network” error when adding some shows to my watchlist on Cinetrak. Any advice? I have logged out and back in. I have also tried on different networks.

You probably have more than 10 items in your (plan to)watchlist already.

Check the topic in announcements

https://forums.trakt.tv/t/freemium-experience-more-features-for-all