How to convert a string value into an object name?

I have a script that brings an error that says Unable to cast value to object...Someone help???

local Player = game.Players.LocalPlayer
Mouse = Player:GetMouse()
local equipped = false
local primary = Player.PlayerData.Inventory.PrimaryTool.Value
local secondary = Player.PlayerData.Inventory.SecondaryTool.Value
print(primary.." "..secondary)

Mouse.KeyDown:connect(function(Key)
    if(Key:lower() == "1") then
        if equipped == false then
        Player.Character.Humanoid:EquipTool(primary)
        equipped = true
        print("equipped primary")
        elseif equipped == true then
        Player.Character.Humanoid:UnequipTools()
        equipped = false
        print("unequipped primary")
        end
        end
    if(Key:lower() == "2") then
        if equipped == false then
        Player.Character.Humanoid:EquipTool(secondary)
        equipped = true
        print("equipped secondary")
        elseif equipped == true then
        Player.Character.Humanoid:UnequipTools()
        equipped = false
        print("unequipped secondary")
        end
        end
end)