The issues related to logging in to the European PC/Mac megaserver have been resolved at this time. If you continue to experience difficulties at login, please restart your client. Thank you for your patience!
This error could be related to addons, so uninstall your addons and try to log in again. To fully remove your add-ons, do the the following in this specific order:
Exit the game
Navigate to C:\Users\<username>\Documents\Elder Scrolls Online\live in windows explorer
Rename Addons to Addons.old
Rename SavedVariables to SavedVariables.old
Check in-game to see if the if the issues persist.
If the issue does not persist, then one of your add-ons is creating the issue. Try re-enabling your preferred add-ons one-by-one in oder to determine which is causing the problem.
If issues persist:
Open the game and go to the settings menu [Esc].
Go to each subsection, Social, Gameplay, etc. and reset all settings to defaults.
Once this is done, try starting the game again.
If after resetting to default and clearing your add-ons and the issue continues, turn off your PC completely, reboot your router and try again.