Getting error when trying to open a feed dialog

I am getting the following error when trying to open a feed dialog..

An error occurred. Please try again later.

Do I need to have users authorize the app to post on their wall? I was thinking it wouldn't because this would not be something that gets published to the user's wall automatically by the app itself. Plus I'm getting the error when I'm using my admin account.

Here is my code:

<script>
  window.fbAsyncInit = function() {
    FB.init({
  appId      : 'xxxxxxxxxxxxxxx', // App ID
  channelURL : 'http://localhost/foods/channel.html', // Channel File
  status     : true, // check login status
  cookie     : true, // enable cookies to allow the server to access the session
  oauth      : true, // enable OAuth 2.0
  xfbml      : true  // parse XFBML
});

// Additional initialization code here
  };

  // Load the SDK Asynchronously
  (function(d){
 var js, id = 'facebook-jssdk'; if (d.getElementById(id)) {return;}
 js = d.createElement('script'); js.id = id; js.async = true;
 js.src = "//connect.facebook.net/en_US/all.js";
 d.getElementsByTagName('head')[0].appendChild(js);
}(document));


function postToFeed() {

    // calling the API ...
    var obj = {
      method: 'feed',
      link: 'https://developers.facebook.com/docs/reference/dialogs/',
      picture: 'http://fbrell.com/f8.jpg',
      name: 'Facebook Dialogs',
      caption: 'Reference Documentation',
      description: 'Using Dialogs to interact with users.'
    };

    function callback(response) {
      document.getElementById('msg').innerHTML = "Post ID: " + response['post_id'];
    }

    FB.ui(obj, callback);
  }
</script>

<a href="javascript:void();" onclick="postToFeed();"><img src="images/share.gif" /></a>