Been getting this error on multiple characters in both dungeons and raids over the last 2 days. No disconnects or anything, just stuck at loading screen when trying to enter a dungeon or raid. After about 1 minute it puts me at the entrance and gives the error message.
Once it happens nothing fixes it, I have tried logging to a different character, reloading, leaving and then rejoining the group etc. It doesn’t happen every time, but it’s becoming more frequent.