Issue when trying to delete users from demo install.

Hello,

I ran the demo install to get the basics installed. After that, I am trying to delete all of the users it imported, and I’m getting an error:

Fatal error: Call to undefined function array_column() in /****/************/public_html/********/wp-content/themes/blackfyre/functions.php on line 3405

Not sure why this is happening. I’m also getting a similar error when trying to remove clan teams that was installed with the demo as well.