Fatal Error: Call To Undefined Function Geoip_country_code_by_name() Why Do I Keep Getting This Fatal Error: Call To Undefined Function:?

Why do I keep getting this Fatal error: Call to undefined function:? - fatal error: call to undefined function geoip_country_code_by_name()

I use Easy Banner Free, and each time I get in touch, please send me: Fatal error: Call to undefined function: DQ () in / homepages/1/d246694071/htdocs/theglitte ... Line 91! What must I do to solve this problem? Please help!