Ошибка "Warning: fread(): Length parameter must be greater than 0 in ...system/library/progroman/citymanager/driver/sxgeo.php"

В system\library\progroman\citymanager\driver\sypex.php

вместо

$sx_geo = new SxGeo($this->sxgeo_path);
$data = $sx_geo->getCityFull($this->ip);

так:

mb_internal_encoding("8bit");
$sx_geo = new SxGeo($this->sxgeo_path);
$data = $sx_geo->getCityFull($this->ip);
mb_internal_encoding("UTF-8");

Или в настройках PHP поставить

mbstring.func_overload = 2