Maintenance for the week of September 8:
• PC/Mac: No maintenance – September 8
• PC/Mac: EU megaserver for maintenance – September 9, 22:00 UTC (6:00PM EDT) - September 10, 16:00 UTC (12:00PM EDT) https://forums.elderscrollsonline.com/en/discussion/682784
Just postig the UI error code does not help here, you need to post the complete error message please ( as text, just mark it in the popup via CTRL+a and then copy it via CTRL+c to the clipboard or use the keybind that is shown to copy the text, if shown).
The ui error codes are only meant to help if you got error messages in vanilla code, not in addons! And then you need to post the code to ZOs via a /bug message ingame at best.