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I'm having this error in opera browser only.

Authorization code... invalid_post_code

I tried to implement the recommendations from https://community.mybb.com/thread-218862.html.
But most of the templates were ok except error_nopermission Template as it has nor <form> tag. I want to know if this is normal.

Site is farmersjoint.com version 1.8.37

Here is the template code:

{$lang->error_nopermission_guest_1}
<ol>
<li>{$lang->error_nopermission_guest_2} <a href="member.php?action=login">{$lang->login}</a> | <a href="member.php?action=register">{$lang->need_reg}</a></li>
<li>{$lang->error_nopermission_guest_3}</li>
<li>{$lang->error_nopermission_guest_4}</li>
<li>{$lang->error_nopermission_guest_5}</li>
</ol>