Cant login after install themes

[mastersly]

Hello When i install mybb and add theme from here its work fine but when i try to login i got this error

Authorization code mismatch. Are you accessing this function correctly? Please go back and try again.

Lets see how to fix it

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GO

admin control panel >> template & style >> tempaltes >> your templates >> portal templates>>member_login

</form>

like this

<input name="my_post_key" type="hidden" value="{$mybb->post_code}"> 
</form>

you also do that step in

portal_welcome_guesttext
 error_nopermission 
 header_welcomeblock_guest

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[BrolySSJ]

It seems that if there is a problem that is relating to log in after there is a change with the theme that there is likely a change that was made to the code that is offsetting the log in.