The law of mitigation of damages is irrelevant to a claim for contractually prescribed liquidated damages under a building contract, because such a claim is for an agreed sum payable upon a specified event, not for damages compensating actual loss caused by breach. An owner's entitlement to liquidated damages for a builder's delay cannot be defeated merely by a finding that the owner acted 'unreasonably' in deferring termination of the contract after the builder's repudiation. A tribunal commits an error of law if it rejects a claim on a ground not raised in the pleadings or submissions, denying the party an opportunity to address the issue.
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