No amendment to or waiver of any provision of this Agreement, and no consent to any departure by any Company herefrom, shall in any event be effective unless in a writing manually signed by or on behalf of the Administrative Agent and the requisite Lenders pursuant to Section 11.1 [Modifications, Amendments or Waivers] of the Credit Agreement. Any such agreement, waiver or consent made with such written consent being effective to bind all the Lenders.