Fatal Error: Call To Undefined Function Geoip_country_code_by_name() PHP Fatal Error: Call To Undefined Function GetAntModelTblInfo()?

PHP Fatal error: Call to undefined function getAntModelTblInfo()? - fatal error: call to undefined function geoip_country_code_by_name()

Can someone tell me why I this error and what can I do?

Also keep in mind that antModelTbl linked to another table called antVendorTbl in a head-to-one (well, without antVendorTbl it antModelTbl). This seems to be the problem because antVendorTbl works perfectly.

Fatal error: Call to undefined function getAntModelTblInfo () in / var / www / html / php / findAntModelTblInfo.ph ... on line 6

Code:
\\ \\ \\ \\ \\ \\ \\ \\ U0026lt;? php
/ / Load feature to all information antModelTbl
include ( "getAntModelTblInfo.php");

/ / GetInfo (land, is $ field) if the application and scope amAntVendorID column siteZip "
getAntModelTblInfo (1 antModel);
?>