The denial of an application or claim after the right to review has been waived or the decision of the Board on appeal has been issued is final and binding upon all parties, including the claimant. No lawsuit may be filed without first exhausting the procedures explained in this Article. No legal action may be commenced or maintained against the Plan or any Trustee or other fiduciary, person or entity involved in the decision more than two years after a claim has been denied on appeal.