Unable to cast value to std::string?

I have a script that is supposed to do stuff like team only tools but I get "Unable to cast value to std::string" every time I try to use it. Here's the script.

game.Players.PlayerAdded:connect(function(player)
	local starterFolder = game.Teams:findFirstChild(player.TeamColor)
    player.CharacterAdded:connect(function(character)
        if starterFolder then
        	starterFolder.PoliceCard:Clone().Parent = player.Backpack
			starterFolder.AK47:Clone().Parent = player.Backpack
        end
    end)
end)

Looks like the issue is that you're using an object that can't hold items as a place to store items. A fix to this would be to use something like ServerStorage (or replicated if you're using a local script), which is made specifically for this purpose.

Here's an edit to your script, which requires you to make a folder inside of ServerStorage, with the name of ["Folder_Items"]. Make sure you put all the weapons in there:

local serStorage = game:GetService('ServerStorage')
local starterFolder = serStorage:WaitForChild('Folder_Items')

game.Players.PlayerAdded:connect(function(player)
	starterFolder.PoliceCard:Clone().Parent = player.Backpack
        starterFolder.AK47:Clone().Parent = player.Backpack
end)

I found a better script. Why not be more helpful guys?

function teamFromColor(color)
for _,t in pairs(game:GetService("Teams"):GetChildren()) do
if t.TeamColor==color then return t end
end
return nil
end

function onSpawned(plr)
local tools = teamFromColor(plr.TeamColor):GetChildren()
for _,c in pairs(tools) do
c:Clone().Parent = plr.Backpack
end
end

function onChanged(prop,plr)
if prop=="Character" then
onSpawned(plr)
end
end

function onAdded(plr)
plr.Changed:connect(function(prop)
onChanged(prop,plr)
end)
end

game.Players.PlayerAdded:connect(onAdded)