attempt to index nil with 'Text' fix?

local frame = script.Parent
local textBox = script.Parent
local open = workspace.openPart
local close = workspace.closePart
local closeBtn = frame.CloseButton
local Players = game:GetService("Players")
local localPlayer = Players.LocalPlayer
local Gold = localPlayer.leaderstats.Gold
local errorGui = localPlayer.PlayerGui:WaitForChild("ErrorGui")
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local remoteEvent = ReplicatedStorage.buySeeds

frame.Visible = false
errorGui.Enabled = false

local price = {
    ['Wheat'] = 100, 
    ['Corn'] = 250, 
    ['Rice'] = 2000, 
    ['Bamboo'] = 8400, 
    ['Soybean'] = 24000, 
    ['Cabbage'] = 57600, 
    ['Carrot'] = 85000, 
    ['Potato'] = 120000
}

for _,UI in pairs(script.Parent:GetDescendants()) do
    if UI:IsA('TextButton') then
        UI.MouseButton1Click:Connect(function(ItemName, player)
            local AmountPurchase = tonumber(UI.Parent:FindFirstChildOfClass('TextBox').Text)
            local Seed = UI.Parent:FindFirstChildOfClass('TextBox').Name:gsub('BuyAmount','')
            --Loops through how many times you entered in the box to purchase
            if AmountPurchase then
                for i=1,AmountPurchase do
                    print(Gold.Value, price[Seed])
                    if Gold.Value >= price[Seed] then
                        Gold.Value -= price[Seed]
                        remoteEvent:FireServer(Seed.Name)
                        print("Successfully Purchased")
                    elseif Gold.Value < price[Seed] then
                        print("Insufficient Funds")
                        errorGui.Enabled = true
                    end
                end
            end
        end)
    end
end

local function openMenu(otherPart)
    frame.Visible = true
        local player = Players:GetPlayerFromCharacter(otherPart.Parent)
        if player.Name == localPlayer.Name then
            localPlayer.Character.Humanoid.WalkSpeed = 0
        end
    end

local function closeMenu()
    frame.Visible = false
    localPlayer.Character.HumanoidRootPart.CFrame = CFrame.new(
        close.Position.X, close.Position.Y + 3, close.Position.Z)
    localPlayer.Character.Humanoid.WalkSpeed = 16
end

open.Touched:Connect(openMenu)
closeBtn.MouseButton1Click:Connect(closeMenu)