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Full Version: My site user can't login it always show this message when correct password
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'Authorization code mismatch. Are you accessing this function correctly? Please go back and try again.'

I upgrade mybb latest but it problem now.. When you create account you can't login it always show this message. 
I can't login in my profile. only can access admin panel. than set password any user. But these user can't login.
see this guidance => authorization code mismatch
MY cms version is 1.8.20 . Give me solution.
Try reading the actual linked guide. You have your solution.