Roblox Script Generated by ScripterAI

"no errors but it warns "Hex color code should start with '#' and be 7 characters long." even after providing a valid hex code #8affa4"

The issue might be due to the HexTextBox.Text containing invisible characters or the hex code not being properly formatted. You can add a print statement to debug the hexColor value:

```lua
ConfirmButton.MouseButton1Click:Connect(function()
    local hexColor = HexTextBox.Text:gsub("^%s*(.-)%s*$", "%1") -- trim leading and trailing white spaces
    print("Hex Color: " .. hexColor) -- Debug print
    print("Length of hexColor: " .. #hexColor)
    if hexColor:sub(1, 1) == '#' and #hexColor == 7 then
        local success, color = pcall(function()
            return Color3.fromHex(hexColor)
        end)
        if success then
            changeLightColor(color)
        else
            warn("Failed to convert hex color code to Color3.")
        end
    else
        warn("Hex color code should start with '#' and be 7 characters long.")
    end
end)
```

This will print the value of hexColor and its length to the output. If the length is not 7 or the first character is not '#', then it means the hex code is not correctly formatted.