title: Blockchain API v1 exception "not found"
body: <p>I've installed local service as described here <a href="https://github.com/blockchain/service-my-wallet-v3" rel="nofollow">https://github.com/blockchain/service-my-wallet-v3</a> and it started sucessfully. But when I'am trying to get balance of my wallet:</p>
  
  <pre><code>$Blockchain = new \Blockchain\Blockchain();
  $Blockchain-&gt;setServiceUrl("http://localhost:3000");
  $Blockchain-&gt;Wallet-&gt;credentials('myid', 'mypass');
  $stats = $Blockchain-&gt;Stats-&gt;get();
  var_dump($stats);
  $balance = $Blockchain-&gt;Wallet-&gt;getBalance();
  var_dump($balance);     
  </code></pre>
  
  <p>I got following exception message:</p>
  
  <pre><code>Fatal error: Uncaught exception 'Blockchain\Exception\ApiError' with message 'No
  t found' in C:\xampp\htdocs\test\Blockchain\Blockchain.php:114
  Stack trace:
  #0 C:\xampp\htdocs\test\Blockchain\Wallet\Wallet.php(47): Blockchain\Blockchain-
  &gt;post('merchant/16d72a...', Array)
  #1 C:\xampp\htdocs\test\Blockchain\Wallet\Wallet.php(55): Blockchain\Wallet\Wall
  et-&gt;call('balance')
  #2 C:\xampp\htdocs\test\wallet.php(26): Blockchain\Wallet\Wallet-&gt;getBalance()
  #3 {main}
    thrown in C:\xampp\htdocs\test\Blockchain\Blockchain.php on line 114
  </code></pre>
  
  <p>What causing this issue and how to resolve it? Thanks!</p>