Mark read tabs not working since last day or so.

[keyser]

In last couple days, the mark read tabs throw error message. I’ve not tried entire forum, but multiple sub forums throw same error. 
Only see on mobile site, on iOS 15.4.1 on Safari. I tried signing in after Google search, and read tab seemed to work. 
Never had issue before. 

Ok, signed out, cleared cache, seems fixed. But never happened before. ??Thx. 

Edited April 9, 2022 by keyser
Pic of error message