MyBB Community Forums

When I try to use the mark all forums as read functionality I get this error:

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You are currently logged in with the username: 'Iman'

What plugins do you have?? The default code doesn't run code to show this error when marking all forums as read.

Maybe the theme is taking me to a wrong page. It only started happening on this new theme.

I don't see how it'd be anything to do with the theme, the URL you click to mark forums read is the same, and the code it executes to mark the forums as read is the same...