title: What is phantom JS error code 1?
body: <p>I get error code #1 when rendering some web pages but not others in phantomJS. The block is in a 3rd party module that calls phantomJS to take the screenshot. </p>
  
  <pre><code>  if (path) {
      phantomProc.on('exit', function(code) {
        if (!calledCallback) {
          calledCallback = true;
  
          // No need to run the timeout anymore.
          clearTimeout(timeoutID);
          cb(code
            ? new Error('PhantomJS exited with return value ' + code)
            : null);
        }
      });
  </code></pre>
  
  <p>What is error code 1? I can't find any reference to phantomJS error codes online. </p>