That worked! Thanks for your help :)
This happens if the file custom/templates/DefaultRevamp/forum/view_topic.tpl is out of date (assuming you are using the default template).
You can update it by editing the file in a text editor, remove all code inside and insert this new code instead: https://raw.githubusercontent.com/NamelessMC/Nameless/v2.0.0-pr12/custom/templates/DefaultRevamp/forum/view_topic.tpl (for pre-release 12 only)
when I want to moderate a topic in the forum I get the message "Invalid token." every time.
Could you tell me how to fix this problem?