What is this error, and how do I fix it?

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10 years ago

I am making a plugin that creates walls along the edges of the selected part, but it keeps coming out with this error:

10:43.551 - Plugin_191344304.MakeWalls.Script:50: bad argument #1 to '?' (Vector3 expected, got number)
10:43.552 - Script 'Plugin_191344304.MakeWalls.Script', Line 50
10:43.552 - Stack End
10:43.553 - Disconnected event because of exception

The code is here:

01local pluginVersion = 0.35
02local hasLoaded = plugin:GetSetting("pluginHasLoaded")
03print("Loading ExplosionCreate Plugin v" .. pluginVersion) --Just a loading message
04if not hasLoaded then
05    plugin:SetSetting("pluginHasLoaded", true)
06end
07 
08-- Setup Toolbar
09local toolbar = plugin:CreateToolbar("dudemanloserr Productions") --Toolbar Name
10local isActive = false
11-- Setup button
12local button = toolbar:CreateButton(
13    "MakeWalls", -- Button Text
14    "MakeWalls Plugin: Click a part to create 3-stud-tall walls, of the same color, along it's edges.", --Text that appears when you hover over the button with the mouse
15    "9869681" -- Button Icon ID
16)
17button.Click:connect(function() -- When the plugin button is clicked, do this stuff.
18    if isActive == false then
19        plugin:Activate(true)
20        isActive = true
21    elseif isActive == true then
22        plugin:Activate(false)
23        isActive = false
24    end
25end)
26 
27--MouseButton1(left mouse) function
28local mouse = plugin:GetMouse()
29mouse.Button1Down:connect(function()
30    if isActive then
31        local targ = mouse.Target
32        local wallsMade = 0 -- Amount of walls made
33        while wallsMade < 4 do --Nobody likes For loops, right?
34            local wall = Instance.new("Part", targ.Parent)
35            wall.Name = "WallPart"
36            wall.BrickColor = targ.BrickColor
37            --Code from here going down makes the walls surfaces the same as the target's
38            wall.BackSurface = targ.BackSurface
39            wall.BottomSurface = targ.BottomSurface
40            wall.FrontSurface = targ.FrontSurface
41            wall.LeftSurface = targ.LeftSurface
42            wall.RightSurface = targ.RightSurface
43            wall.TopSurface = targ.TopSurface
44            --The surfaces should be the same by this point.
45            local x = targ.Position.X-targ.Size.X/2
46                local y = targ.Position.Y+targ.Size/2       -- (LINE 50)
47            local z = targ.Position.Z
48            if wallsMade == 0 then --Negative X
49                wall.Position = Vector3.new(x, y, z)
50                wall.Size = Vector3.new(targ.Size.X, 3, 1)
51            elseif wallsMade == 1 then
52                x = targ.Position.X
53                z = targ.Position.Z-targ.Size.Z/2
54                wall.Position = Vector3.new(x, y, z) --Negative Z
55                wall.Size = Vector3.new(1, 3, targ.Size.Z)
56            elseif wallsMade == 2 then
57                x = targ.Position.X+targ.Size.X/2
58                z = targ.Position.Z
59                wall.Position = Vector3.new(x,y,z) --Positive X
60                wall.Size = Vector3.new(targ.Size.X, 3, 1)
61            elseif wallsMade == 3 then
62                x = targ.Position.X
63                z = targ.Position.Z+targ.Size/2
64                wall.Position = Vector3.new(x,y,z) --Positive Z
65                wall.Size = Vector3.new(1, 3, targ.Size.Z)
66            end
67            wallsMade = wallsMade + 1
68        end
69    end
70end)
71print("Loaded WallsPlug Plugin v" .. pluginVersion) --Another loading message
 View all 71 lines...

What is this error, and how do I fix it?

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