Checking TokenBalance of other token contract

Question

I try to simply check a users DAI token balance on Kovan testnet (ContractAddress: 0xC4375B7De8af5a38a93548eb8453a498222C4fF2) with the following code:

pragma solidity ^0.4.16;

contract ERC20 {
  function balanceOf(address who) constant returns (uint256);
}

contract myTest {

  ERC20 myToken;

  function setToken(address tokenAddress) {
    myToken = ERC20(tokenAddress);
  }

  function getTokenBalanceOf(address h0dler) constant returns (uint balance) {
    return myToken.balanceOf(h0dler);
  }
}

When exucting the getTokenBalanceOf function Remix throughs an error:

"call to myTest.getTokenBalanceOf errored: VM error: revert. revert The transaction has been reverted to the initial state. Note: The called function should be payable if you send value and the value you send should be less than your current balance. Debug the transaction to get more information. "

Answer 1

Make Sure that you are calling function getTokenBalanceOf() after the call setToken() function. hope this will help you.