You have not Installed GEO IP:
Steps(Debian Wheezy Specific):
1. aptitude install libgeoip-dev php5-geoip php5-geo
2. aptitude install php5-dev
3. pecl install geoip
4. cd /etc/php/apache2
5. rmate php.ini
6. Add to ectensions
7. extension=geoip.so
modified from: IT Knowledge Base