[Help] Table Index is nil

[Backsage]

Hello again, I need some help. I won't post the whole code because it's not important. But

  
function processClick() 
x = tonumber(guiGetText(GUIEditor.edit[1])) 
y = tonumber(guiGetText(GUIEditor.edit[2])) 
z = tonumber(guiGetText(GUIEditor.edit[3])) 
r = tonumber(guiGetText(GUIEditor.edit[4])) 
  
cor = {} 
cor[coordinates] = {} 
--table.insert(cor, {x, y, z, r}) 
  
  
  
    if not x and not y and not z and not r then 
        outputChatBox("Input must be in numbers") 
    elseif x and y and z and r then 
        table.insert(cor, {x, y, z, r}) 
        for i=1, #cor do 
            local _x, _y, _z, _r = cor[i][1], cor[i][2], cor[i][3], cor[i][4] 
            table.insert(cor[coordinates], {_x, _y, _z, _r}) 
            for i, tableData in ipairs (cor[coordinates]) do 
                local tName, tx, ty, tz = unpack(tableData) 
                outputChatBox(" " .. tName ..  " " .. tx .. " " .. ty .. " " .. tz ) 
            end 
        end 
  
    end 
end 
  

whenever I click a button called "Set", I get an error:

ERROR: teleportscript4\gui2.lua:142:table index is nil

and whenever I do

  
function processClick() 
x = tonumber(guiGetText(GUIEditor.edit[1])) 
y = tonumber(guiGetText(GUIEditor.edit[2])) 
z = tonumber(guiGetText(GUIEditor.edit[3])) 
r = tonumber(guiGetText(GUIEditor.edit[4])) 
  
cor = { 
coordinates = {}, 
} 
  
--table.insert(cor, {x, y, z, r}) 
  
  
  
    if not x and not y and not z and not r then 
        outputChatBox("Input must be in numbers") 
    elseif x and y and z and r then 
        table.insert(cor, {x, y, z, r}) 
        for i=1, #cor do 
            local _x, _y, _z, _r = cor[i][1], cor[i][2], cor[i][3], cor[i][4] 
            table.insert(cor[coordinates], {_x, _y, _z, _r}) 
            for i, tableData in ipairs (cor[coordinates]) do 
                local tName, tx, ty, tz = unpack(tableData) 
                outputChatBox(" " .. tName ..  " " .. tx .. " " .. ty .. " " .. tz ) 
            end 
        end 
  
    end 
end 
  

I get an error: ERROR:teleportscript3\gui2.lua:155: bad argument #1 to 'insert' (table expected, got nil)

Strangely, when I do

  
function processClick() 
x = tonumber(guiGetText(GUIEditor.edit[1])) 
y = tonumber(guiGetText(GUIEditor.edit[2])) 
z = tonumber(guiGetText(GUIEditor.edit[3])) 
r = tonumber(guiGetText(GUIEditor.edit[4])) 
  
cor = { 
} 
coordinates = {} 
  
--table.insert(cor, {x, y, z, r}) 
  
  
  
    if not x and not y and not z and not r then 
        outputChatBox("Input must be in numbers") 
    elseif x and y and z and r then 
        table.insert(cor, {x, y, z, r}) 
        for i=1, #cor do 
            local _x, _y, _z, _r = cor[i][1], cor[i][2], cor[i][3], cor[i][4] 
            table.insert(coordinates, {_x, _y, _z, _r}) 
            for i, tableData in ipairs (coordinates) do 
                local tName, tx, ty, tz = unpack(tableData) 
                outputChatBox(" " .. tName ..  " " .. tx .. " " .. ty .. " " .. tz ) 
            end 
        end 
  
    end 
end 
  

It works, but I know this can't be the only way of making it work because when I do

  
for i, tableData in ipairs(allowedTeams) do 
    local tName, tR, tG, tB = unpack(tableData) 
    outputChatBox(" " .. tName .. " " .. tR .. " " .. tG .. " " .. tB )  
    createTeam(tName, tR, tG, tB) 
end 
  

and

  
function populateGridlist() 
        local rootnode = xmlLoadFile("vehicles.xml") 
         
        -- create a blank global table to store our imported data 
        vehicleTable = {} 
         
        if rootnode then 
            for _,group in ipairs(xmlNodeGetChildren(rootnode)) do 
                -- create an entry in the gridlist for every vehicle "group" 
                local row = guiGridListAddRow(gridlistVehicleSelection) 
                 
                local name = xmlNodeGetAttribute(group,"type") 
                 
                guiGridListSetItemText(gridlistVehicleSelection,row,1,name,false,false) 
                 
                --add an entry containing the group name into the table 
                vehicleTable[name] = {} 
                 
                -- we will use the custom data "header" to indicate that this entry can be expanded/collapsed 
                guiGridListSetItemData(gridlistVehicleSelection,row,1,"header")  
                 
                -- then, for every group that we find, loop all of its children (the vehicle nodes) and store them in a table 
                for _,vehicle in ipairs(xmlNodeGetChildren(group)) do 
                    local vname = xmlNodeGetAttribute(vehicle, "name") 
                    local id = xmlNodeGetAttribute(vehicle, "id") 
                     
                    -- insert both the vehicle id and the vehicle description into the table 
                    table.insert(vehicleTable[name],{id,vname}) 
                    for i, tableData in ipairs (vehicleTable[name]) do 
                        local name1, type1 = unpack(tableData) 
                        outputChatBox(" " .. name1 .. " " .. type1 ) 
                    end 
                     
                end 
            end 
             
            -- set element data on the gridlist so we know which group is currently showing 
            setElementData(gridlistVehicleSelection,"expanded","none") 
             
            -- unload the xml file now that we are finished 
            xmlUnloadFile(rootnode) 
        end 
end 
  

It works. So how can I make it work like either of these two solutions?