According to the regulation, the party is due to the breach of properly, it can appear from the non-breaching party according to the circumstances.

根据规定，当事人一方违约是由于免责事由的出现造成的，则可以根据情况免除违约方的违约责任。

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The non-breaching party must prove its damages providing evidence establishing to a reasonable certainty the nature and extent of the probable loss it has sustained or will in the future sustain.

FORBES: Oakley v. Rory McIlroy and Nike: Enforcing Rights Of First Refusal In Endorsement Agreements