I have the same error in many scripts
Thanks For HELP 
I have the same error in many scripts
Thanks For HELP 
You are using older version of es_extended and thats why there is no fucntion RegisterCommand in it thats why u have this error.
Copy paste function inside of es_extended if you dont know how then replace it with new one.
ESX.Trace = function(str)
if Config.EnableDebug then
print('ESX> ’ … str)
end
end
ESX.SetTimeout = function(msec, cb)
local id = ESX.TimeoutCount + 1
SetTimeout(msec, function()
if ESX.CancelledTimeouts[id] then
ESX.CancelledTimeouts[id] = nil
else
cb()
end
end)
ESX.TimeoutCount = id
return id
end
ESX.ClearTimeout = function(id)
ESX.CancelledTimeouts[id] = true
end
ESX.RegisterServerCallback = function(name, cb)
ESX.ServerCallbacks[name] = cb
end
ESX.TriggerServerCallback = function(name, requestId, source, cb, …)
if ESX.ServerCallbacks[name] ~= nil then
ESX.ServerCallbacks[name](source, cb, …)
else
print(‘es_extended: TriggerServerCallback => [’ … name … ‘] does not exist’)
end
end
ESX.SavePlayer = function(xPlayer, cb)
local asyncTasks = {}
xPlayer.setLastPosition(xPlayer.getCoords())
-- User accounts
for k,v in ipairs(xPlayer.accounts) do
if ESX.LastPlayerData[xPlayer.source].accounts[v.name] ~= v.money then
table.insert(asyncTasks, function(cb)
MySQL.Async.execute('UPDATE user_accounts SET money = @money WHERE identifier = @identifier AND name = @name', {
['@money'] = v.money,
['@identifier'] = xPlayer.identifier,
['@name'] = v.name
}, function(rowsChanged)
cb()
end)
end)
ESX.LastPlayerData[xPlayer.source].accounts[v.name] = v.money
end
end
-- Inventory items
for k,v in ipairs(xPlayer.inventory) do
if ESX.LastPlayerData[xPlayer.source].items[v.name] ~= v.count then
table.insert(asyncTasks, function(cb)
MySQL.Async.execute('UPDATE user_inventory SET count = @count WHERE identifier = @identifier AND item = @item', {
['@count'] = v.count,
['@identifier'] = xPlayer.identifier,
['@item'] = v.name
}, function(rowsChanged)
cb()
end)
end)
ESX.LastPlayerData[xPlayer.source].items[v.name] = v.count
end
end
-- Job, loadout and position
table.insert(asyncTasks, function(cb)
MySQL.Async.execute('UPDATE users SET job = @job, job_grade = @job_grade, loadout = @loadout, position = @position WHERE identifier = @identifier', {
['@job'] = xPlayer.job.name,
['@job_grade'] = xPlayer.job.grade,
['@loadout'] = json.encode(xPlayer.getLoadout()),
['@position'] = json.encode(xPlayer.getLastPosition()),
['@identifier'] = xPlayer.identifier
}, function(rowsChanged)
cb()
end)
end)
Async.parallel(asyncTasks, function(results)
RconPrint('[SAVED] ' .. xPlayer.name .. "^7\n")
if cb ~= nil then
cb()
end
end)
end
ESX.SavePlayers = function(cb)
local asyncTasks = {}
local xPlayers = ESX.GetPlayers()
for i=1, #xPlayers, 1 do
table.insert(asyncTasks, function(cb)
local xPlayer = ESX.GetPlayerFromId(xPlayers[i])
ESX.SavePlayer(xPlayer, cb)
end)
end
Async.parallelLimit(asyncTasks, 8, function(results)
RconPrint('[SAVED] All players' .. "\n")
if cb ~= nil then
cb()
end
end)
end
ESX.StartDBSync = function()
function saveData()
ESX.SavePlayers()
SetTimeout(10 * 60 * 1000, saveData)
end
SetTimeout(10 * 60 * 1000, saveData)
end
ESX.GetPlayers = function()
local sources = {}
for k,v in pairs(ESX.Players) do
table.insert(sources, k)
end
return sources
end
ESX.GetPlayerFromId = function(source)
return ESX.Players[tonumber(source)]
end
ESX.GetPlayerFromIdentifier = function(identifier)
for k,v in pairs(ESX.Players) do
if v.identifier == identifier then
return v
end
end
end
ESX.RegisterUsableItem = function(item, cb)
ESX.UsableItemsCallbacks[item] = cb
end
ESX.UseItem = function(source, item)
ESX.UsableItemsCallbacksitem
end
ESX.GetItemLabel = function(item)
if ESX.Items[item] ~= nil then
return ESX.Items[item].label
end
end
ESX.CreatePickup = function(type, name, count, label, playerId)
local pickupId = (ESX.PickupId == 65635 and 0 or ESX.PickupId + 1)
local xPlayer = ESX.GetPlayerFromId(playerId)
ESX.Pickups[pickupId] = {
type = type,
name = name,
count = count,
label = label,
coords = xPlayer.getCoords()
}
TriggerClientEvent('esx:pickup', -1, pickupId, label, playerId)
ESX.PickupId = pickupId
end
ESX.DoesJobExist = function(job, grade)
grade = tostring(grade)
if job and grade then
if ESX.Jobs[job] and ESX.Jobs[job].grades[grade] then
return true
end
end
return false
end
i updated it Thank u 
welcome
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