How do you fix a attempt to get length of upvalue 'maps' (a userdata value) error?

Asked by

8 years ago

This is my script;

01local replicatedStorage = game:GetService("ReplicatedStorage")
02local maps = replicatedStorage:WaitForChild("Maps")
03 
04function pickMap()
05    local mapList = maps:GetChildren() -- Declares a table of the maps inside of the Maps folder.
06    local selectedIndex = math.random(1,#maps) -- Choose a random number between 1, and the number of maps available.
07    local map = mapList[selectedIndex]:Clone() -- Create a clone of the map we selected.
08    map.Parent = workspace -- Parent it to the workspace.
09    map.Name = "Map" -- Rename the map so that we can use the unloadMap() function later to remove it.
10    return mapList[selectedIndex].Name -- Return the name of the map we selected, in case we want to display it.
11end
12 
13function unloadMap()
14    if workspace:FindFirstChild("Map") then -- If there is a model in the Workspace named "Map"
15        workspace.Map:Destroy() -- Destroy it!
16    end
17end
18 
19local h = Instance.new("Hint")
20h.Parent = workspace
21 
22while true do
23    h.Text = "Picking new map..."
24    wait(3)
25    local mapName = pickMap()
26    h.Text = "Selected map: "..mapName
27    wait(3)
28    h.Text = "Unloading map..."
29    unloadMap()
30    wait(3)
31end
 View all 31 lines...

This is the entire output;

0122:32:56.305 - The Place I Learn To Script/Build was auto-saved to C:/Users/BlackOrange3343/Documents/ROBLOX/AutoSaves/Place_AutoSave_38.rbxl
02Ragdoll Physics Loaded
03Hello world!
0422:32:59.642 - Humanoid is not a valid member of Script
0522:32:59.644 - Stack Begin
0622:32:59.645 - Script 'Plugin_144773946.RealRagdoll.Ragdoll', Line 4
0722:32:59.646 - Stack End
08Loading Cutscene Editor...
09Bouyer's Ragdoll Physics Loaded
10Finished Loading.
11Loading Tree Gen...
12Finished Loading Tree Gen
1322:33:00.580 - Unable to load plugin icon. (x2)
14Realism Mod is running on v1.795!
15Cutscene Editor Loaded
16Hello world!
1722:33:03.719 - Workspace.MapChooser:6: attempt to get length of upvalue 'maps' (a userdata value)
1822:33:03.721 - Stack Begin
1922:33:03.723 - Script 'Workspace.MapChooser', Line 6 - global pickMap
2022:33:03.724 - Script 'Workspace.MapChooser', Line 25
2122:33:03.725 - Stack End
2222:33:05.714 - Infinite yield possible on 'Workspace:WaitForChild("Explosion Course")'
2322:33:05.718 - Stack Begin
2422:33:05.720 - Script 'ServerScriptService.ExplodePartScript', Line 17
2522:33:05.722 - Stack End
 View all 25 lines...

This is the error in the output;

33:03.719 - Workspace.MapChooser:6: attempt to get length of upvalue 'maps' (a userdata value)
33:03.721 - Stack Begin
33:03.723 - Script 'Workspace.MapChooser', Line 6 - global pickMap
33:03.724 - Script 'Workspace.MapChooser', Line 25
33:03.725 - Stack End

There are 2 lines with the error;

`1`	`local` `selectedIndex` `=` `math.random(1,#maps)` `-- Choose a random number between 1, and the number of maps available.`

and

`1`	`local` `mapName` `=` `pickMap()`

How can you fix this? Explain, thanks for any support, comments and answers!

thank you for asking this question it helped me. :o) chasedig1 115 — 6y

How do you fix a attempt to get length of upvalue 'maps' (a userdata value) error?

1 answer

Answer this question