FOP2 Community Forum

How do I fix this? (FOP2 2.31.28, Asterisk v 13.38.3, FreePBX 16.0.30)
Fatal error: Uncaught Error: Call to undefined function mysql_real_escape_string() in /var/www/html/fop2/lib/dbgrid.php on line 543
( ! ) Error: Call to undefined function mysql_real_escape_string() in /var/www/html/fop2/lib/dbgrid.php on line 543

I get the following error:

Could not contact registration server, please try again later. at /tmp/par-root/...../inc/lib/FOP2/License.pm