SCRIPT ERROR: @esx_gangs/server.lue:99:attempt to index a nil value (field '?')

Question

1.\';local gangData = { 2. name = _gang, 3. gang_grade = tonumber(_grade), 4. gang_name = ESX.Gangs[gang].ranks[tonumber(grade)].label, 5. gang_grade_label = ESX.Gangs[gan