Fatal error

[Zenith]

Fatal error: Call to undefined function is_user_online() in /home/zenith/public_html/memberlist.php on line 534

What is this?
Only happens when click a member name

 

[Hitakashi]

What forum software?....

 

[Nathan]

Obviously phpBB 🙂

@ Zenith, please as not everyone is experienced with each forum software, state what your using.

As for your issue:

It's due to the mod you just installed, I see it's for 3.0.5 therefore it may be outdated, im not to sure how to fix it as I don't have the code infront of me.