change_forward_address method Disappeared 

Hello,


I follow this instruction to deploy an upgradable contract [link](https://github.com/paritytech/ink-examples/tree/main/upgradeable-contracts/forward-calls). When I have to deploy the contract only gives me 2 methods flip and get. When I want to change the forward contract to invoke the change_forward_address method, the method Disappeared. Please help 