canvasWelcome.SetActive(false); Unexpected symbol 'canvasWelcome'?????

IEnumerator DisableCanvas()
{
yield return new WaitForSeconds(3.5f)
canvasWelcome.SetActive(false);
}

You missing a “;” after “(3.5f)”

  IEnumerator DisableCanvas()
        {
            yield return new WaitForSeconds(3.5f);
            canvasWelcome.SetActive(false);
        }