Installation: Stock at Step 0

I uploaded Gibbon core (v13.0.01), navigated to the my URL:
I got this error:

Fatal error: Call to undefined function Gibbon\session_status() in /home/website/public_html/gibbon/src/Gibbon/session.php on line 57

Any ideas what causes this error?

Hi bgbs,

It sounds like your system might be running an older version of PHP. Can you check your web server to see which version is installed? Gibbon v13 requires a minimum of PHP 5.5 and MySQL 5.0. More info can be found in the Installation Guide:

Hope this helps!

awesome, that worked. thanks