If either party cannot fulfill their part of the agreement, it should be discussed amicably first. Your first option may be to simply amend or alter the original contract. If altering the contract is not an option, you'll want to review the original contract to see what options for quitting the contract outlined in the original agreement. You may be able to get out of a contract without legal consequences if both parties agree to how the contract can be quitted. If both parties cannot agree on how to solve the problem, you may need to consider mediation or small claims court.