upon or after the breach of any material provision of this Agreement if the breaching Party has not cured such breach within ​ days following receipt of written notice from the non-breaching Party requesting cure of the breach or, if such breach is not susceptible of cure within such sixty ​ day period, the breaching Party has not taken appropriate steps to commence such cure during such ​-day period and continued to diligently pursue such cure in a manner reasonably assuring such cure within a reasonable period of time thereafter (not to exceed ​ days). Any right to terminate under this Section 12.03(a) shall be stayed and the cure period tolled in the event that, during any cure period, the Party alleged to have been in material breach shall have initiated dispute resolution in accordance with Article XIII with respect to the alleged breach, which stay and tolling shall last so long as the allegedly breaching Party diligently and in good faith cooperates in the prompt resolution of such dispute resolution proceedings; or