Please help me fix this error!

Help and Feedback Scripting Support
#1

Hello devs, I received an error in the output: “attempt to concatenate nil with string”. Could you please help me fix this issue? I don’t know what’s wrong with it. Any feedback would be appreciated. Thank you!

Script 1:

local TS = game:GetService("TeleportService")
local DSS = game:GetService("DataStoreService")

local event = game.ReplicatedStorage.Events.CreateServer
local e2 = game.ReplicatedStorage.Events.JoinServer

event.Event:Connect(function(creator, mapname)
    local tableforjoin = {}
    
    table.insert(tableforjoin, creator)
    
    local reserved = TS:ReserveServer(12607086809)
    local ID = 1
    local canID = false
    
    repeat
        if DSS:GetDataStore(ID):GetAsync("G") == nil then
            canID = true
            DSS:GetDataStore(string.sub(reserved, 1,8)):SetAsync("G", ID)
            DSS:GetDataStore(ID):SetAsync("G", creator.UserId)
            DSS:GetDataStore(ID .. "2"):SetAsync("G", reserved)
            DSS:GetDataStore(ID .. "3"):SetAsync("G", mapname)
        else
            ID += 1
        end
    until canID == true
    
    wait(.1)
    TS:TeleportToPrivateServer(12607086809, reserved, tableforjoin)
end)

e2.OnServerEvent:Connect(function(plr, id)
    local tableforjoin = {}

    table.insert(tableforjoin, plr)
    
    local searchserver = DSS:GetDataStore(id .. "2"):GetAsync("G")
    
    TS:TeleportToPrivateServer(12607086809, searchserver, tableforjoin)
end)

script 2:

local DSS = game:GetService("DataStoreService")

local reserved = game.PrivateServerId

local ID = DSS:GetDataStore(string.sub(reserved, 1,8)):GetAsync("G")
local mapname = DSS:GetDataStore(ID .. "3"):GetAsync("G")

local newmap = game.ReplicatedStorage.Maps:FindFirstChild(mapname):Clone()
game.Workspace:FindFirstChild("Map"):Destroy()
newmap.Parent = game.Workspace
newmap.Name = "Map"

game.Players.PlayerAdded:Connect(function(plr)
    plr.PlayerGui.ID.TextLabel.Text = ID
end)

output:

Line 6 attempt to concatenate nil with string
-- error from script 2

Any feedback would be appreciated. Thank you!

#2

If you are trying to run script 2 in a non-reserved server then it’ll throw “” aka empty. But not nil!

Below is what roblox does as a check to see what type of server you’re currently in.

local function getServerType()
	if game.PrivateServerId ~= "" then
		if game.PrivateServerOwnerId ~= 0 then
			return "VIPServer"
		else
			return "ReservedServer"
		end
	else
		return "StandardServer"
	end
end

print(getServerType())

Essentially, not ever server you join will return a PrivateServerId

#3

but, its reserved

and thank you for ur feedback!,

i hope it will be fixed!

#4

Did you run the code in a reservedserver or a regular server?

#5

if i run that script in command bar it says reserved server

and yes

the script 1 in regular

script 2 in reserved

#6

Run this print(game.PrivateServerId) in command bar and tell me what it returns with.

Do you have script2 disabled until you join a server thats reserved?

#7

it prints c065561d-eaaf-47f3-a864-dde9cadc2ec5
and the script 2 is runned in the reserved server

#8

Awesome, with this in mind, can you then do a print(ID,mapname) and see what it returns with?

I’ve replicated your error on my end. It is ID that returns nil

#9

the same error, idk why

it prints the same error…

#10

Script - Roblox Studio (gyazo.com)

Here is what I got, Ill take a look and see whats going on.

So, the issue is because when you call “GetAsync” in script2 it calls the table; however, the table is showing as nil. This means the data that was stored/saved/updated using SetAsync in this table from script1 was most likely never saved properly.

GlobalDataStore | Roblox Creator Documentation

1 Like
#11

Updated my comment. Ill take a look into seeing why your table doesnt save.

#12

Join system work
but
yea
about the map loading of the create server
thats what not work

we are not saving the table as map name

we are saving a string

#13

Alright, we can try wrapping your script1 when you call ‘SetAsync’ inside of a pcall.

I’d recommend something along these lines;

    local code = nil
	local success,err = pcall(function()
		code = DSS:GetDataStore(ID):SetAsync("G", creator.UserId)
	end)
    if success and code then
    end
#14

we, dont use the creator anyore we only use mapname now.

#15

To understand properly, we no longer get the error at line 6?

But we are now getting a different error?

#16

we do and its about the map name

#17

Alright, one thing I do notice in script1,

    local reserved = TS:ReserveServer(12607086809)
    local ID = 1
    local canID = false
    repeat
        if DSS:GetDataStore(ID):GetAsync("G") == nil then
            canID = true
            DSS:GetDataStore(string.sub(reserved, 1,8)):SetAsync("G", ID)
            DSS:GetDataStore(ID):SetAsync("G", creator.UserId)
            DSS:GetDataStore(ID .. "2"):SetAsync("G", reserved)
            DSS:GetDataStore(ID .. "3"):SetAsync("G", mapname)
        else
            ID += 1
        end
    until canID == true

If ID in script1 == 1 or 12 or 13, but in script2 that runs on the reservedserver is calling code as DSS:GetDataStore(string.sub(reserved, 1,8)):GetAsync("G"), which will return as a different string or number that compared to script1.

Because if you notice,

local ID = DSS:GetDataStore(string.sub(reserved, 1,8)):GetAsync("G")
local mapname = DSS:GetDataStore(ID .. "3"):GetAsync("G")

ID would not return 1 or 12 or 13 as it is SetAsynced in script1. Therefore, mapname would not exist and return nil.

#18

the id system is working but the nil to string mapname is not

And, sorry for the confusion.

I dont understand

#19 
            DSS:GetDataStore(ID):SetAsync("G", creator.UserId)
            DSS:GetDataStore(ID .. "2"):SetAsync("G", reserved)
            DSS:GetDataStore(ID .. "3"):SetAsync("G", mapname)

This code from script 1 will never be the same be picked up by script2.

This is because the ID you are calling in script 2 is NOT the same as the one you call in script1.

The ID in script 1 will NOT be a reservedserver code/id. It is just a number that counts up (i.e 1,2,3,4, etc)

#20

how do we fix it?

i am not sure how to fix this…