post installation problem PHP Fatal error

CentOS Linux release 7.5.1804 (Core)
OCSNG_UNIX_SERVER_2.4.1

After successful ./setup.sh, I browse to here as instructions said.

http://XXX.XXX.XXX.XXX/ocsreports/

But the page is blank.  logs are as follows ...

access_log:

xxx.xxx.xxx.xxx - - [18/May/2018:10:52:59 -0700] "GET /ocsreports/ HTTP/1.1" 500 - "-" "Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0"

error_log:

[Fri May 18 10:52:59.064777 2018] [:error] [pid 9511] [client xxx.xxx.xxx.xxx:42748] PHP Fatal error:  Call to undefined function mysqli_real_escape_string() in /usr/share/ocsinventory-reports/ocsreports/require/function_commun.php on line 66

I think the database isn't being installed.   I tried on another new system and played around with

trying to get the database initiated, but still can't get past this.