Deployed contract cannot call another deployed contract

[Guti]

I can not make my code work.

I tried to execute the example contract of the following post and neither:

https://ethereum.stackexchange.com/questions/24713/how-can-a-deployed-contract-call-another-deployed-contract-by-interface-and-ad

pragma solidity ^0.4.11;

contract Service{
  function isAlive() public constant returns(bool alive) {
    return true;
  }
}

pragma solidity ^0.4.11;

// describe the interface

contract Service{
  function isAlive() constant returns(bool alive) {} // empty because we're not concerned with internal details
}

contract Client {
  Service _s; // "Service" is a Type and the compiler can "see" it because this is one file. 

  function Client(address serviceAddress) {
    _s = Service(serviceAddress); // _s will be the "Service" located at serviceAddress
  }

  function Ping() public constant returns(bool response) {
    return _s.isAlive(); // message/response to Service is intuitive
  }
}

[Earlz]

What kind of error are you encountering?

[Guti]

Have you tried to run code that calls another contract?

[web3shannon]

see #548