need urgent help – fatal error

I am receiving this error message after installing the plugin:

Fatal error: Call to undefined function session_status() in /data/27/1/66/22/1392511/user/1494360/htdocs/samson/wp-content/plugins/contus-video-gallery/helper/watch_history.php on line 2

This is making it impossible for me to access any parts of my site from the dashboard – how do I fix this? Is it as simple as deleting the plugin from the FTP?

Thank you!