The binding legal principles established are: (1) Under the doctrine of mootness, a court may decline jurisdiction over a matter when the dispute becomes academic by reason of changed circumstances, particularly where the order sought to be rescinded has already been executed and acted upon; (2) In an application for rescission under Rule 29(1)(a), the applicant must prove that the judgment was granted in error by the court itself; (3) The failure to cite a party who was not privy to the underlying contract does not constitute an error of the court justifying rescission under Rule 29(1)(a); (4) It is not the court's duty to search for and identify potential interested parties - that responsibility rests with the litigants; (5) Where a party has a valid contractual claim and has fulfilled all contractual obligations (such as full payment of purchase price), the court may grant specific performance even if there are competing claims from third parties who were not privy to the contract.