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Fatal error: Cannot redeclare geoip_country_code_by_name() in [...]/sites/all/modules/geoip/lib/geoip.inc on line 376
This happens when the geoip PECL extension is enabled on the server.
GeoIP API currently only supports the pure PHP lib that comes with the module and not the geoip PECL extension.
This is not stated on the project page nor in the INSTALL.txt.