eged oral contract is unavailing. "Intentions not expressed in the writing are deemed to have no existence and may not be shown by parol evidence." Aultman Hosp. Ass'n v. Cmty. Mut. Ins. Co., 46 Ohio St. 3d 51, 53, 544 N.E.2d 920 (1989) (citation omitted). E. Plaintiffs' Promissory Estoppel Claim is Barred