In the United Kingdom, the offence in the Contracts of Infringement Act 1977 is defined as: [i] Non-performance, [ii] poor performance, [iii] partial performance or [iv] performance significantly different from what was reasonably expected. Innocent parties can only revoke the contract because of a serious breach (breach of the condition), but they can still claim damages provided that the breach caused foreseeable harm. An error is a misunderstanding of one or more parties and can be invoked as a reason for the invalidity of the agreement. The Common Law has identified three types of errors in the treaty: frequent errors, reciprocal errors and unilateral errors. An agreement may simply consist of one party accepting another party`s offer. As this scenario does not involve consideration, it is not a contract. Other common examples of agreements that are not contracts are gentlemen`s agreements and unauthorized betting pools. . . .