11 The Arbitrator concluded that the claimant was not entitled to payment for the amounts claimed in progress claims 12A and 12B. Rather, he found that the first respondents, in paying the applicant $14,331.90, had paid all they were obliged to pay. For present purposes, that finding of fact can be accepted. In other words, it can be accepted that the appropriate amount of the progress claim was $14,331.90. At the hearing of this application, counsel for the applicant attempted to demonstrate that there had been an arithmetical miscalculation by the Arbitrator. Even assuming that such an error had been made, it is not an error of such significance as would warrant the grant of leave to appeal. So that factor can be put to one side. Having found then that the first respondents had paid all that they were obliged to pay, the Arbitrator went on to hold that there was no basis upon which the applicant could have issued a notice of default and consequently, no basis upon which the contract could have been terminated. In other words, he was satisfied that the first respondents had made out their defence to the counterclaim: see pages 22 to 24 of the Arbitrator's First Interim Award.