cannot transition from error action

I want to transition to a "oops" route when there is error loading model. My router looks like:

import Ember from 'ember';
import config from './config/environment';

var Router = Ember.Router.extend({
  location: config.locationType
});

export default
Router.map(function() {
  this.resource('invitations', {path: '/invitations'});
  this.resource('oops');
});

InivitationsRoute has error action defined as:

import Ember from 'ember';

export default
Ember.Route.extend({

  actions: {

    error: function(error, transition) {

      if (error && error.status === 500) {
        transition.abort();
        this.transitionTo('oops',{'a':'b'});
      }

      // Return true to bubble this event to any parent route.
      return false;
    }

  }
});

Now the problem i am seeing is, if I pass an object to the this.transitionTo('oops',{'a':'b'}); , then ember doesn't even try to do a transition, but if I just did this.transitionTo('oops');, it would transition to the route. The problem is I want to pass error JSON as model to this route!

My OopsRoute is minimalistic :

import Ember from 'ember';

export default
Ember.Route.extend({

  setupController: function(controller, model) {
    this._super(controller, model);
  }
});

Can't seem to understand why it wouldn't work! Using ember : 1.11.3