When trying to upload multiple sizes, i get an Unexpected object in htmljs error

[THPubs]

I'm trying to upload multiple images like this :

  photos: {
    type: [Object],
    label: 'Photo ( Photo should have a width of 340px and a height of 190px )',
    autoform: {
      type: 'slingshotFileUpload',
      removeLabel: 'Remove', // (optional, defaults to "Remove")
      afFormGroup: { // (optional)
        label: false
      },
      afFieldInput: {
        thumbnail: 'thumb',
        slingshotdirective: {
          thumb: {
            directive: "achievementPhotoThumbnailUpload",
            onBeforeUpload: function (file, callback) {
              // Create a mobile 640x640 size version.
              Resizer.resize(file, {
                width: 340,
                height: 190,
                cropSquare: true
              }, function (err, file) {
                if (err) {
                  console.error(err);
                }
                callback(file);
              });
            }
          },
          original: 'achievementPhotoUpload'
        }
      }
    }
  },
  'photos.$.key': {
    type: String
  },
  'photos.$.filename': {
    type: String
  },
  'photos.$.src': {
    type: String
  },
  'photos.$.directive': {
    type: String
  },

But when I navigate to the form, it gives me a blank page and shows this error in the console :

Exception in defer callback: Error: Unexpected object in htmljs in toText: [object Object]
    at HTML.ToTextVisitor.def.visitObject (http://localhost:3000/packages/htmljs.js?hash=6c22e7d941777b671e2b03be4fe909e9f276f9ea:292:11)
    at HTML.Visitor.def.visit (http://localhost:3000/packages/htmljs.js?hash=6c22e7d941777b671e2b03be4fe909e9f276f9ea:113:31)
    at Object.HTML.toText (http://localhost:3000/packages/htmljs.js?hash=6c22e7d941777b671e2b03be4fe909e9f276f9ea:668:18)
    at Object.Blaze._toText (http://localhost:3000/packages/blaze.js?hash=7abafff7bd98fa1fc0a6478fb26dd08cdd3fe7ee:2411:15)
    at updateAttributes (http://localhost:3000/packages/blaze.js?hash=7abafff7bd98fa1fc0a6478fb26dd08cdd3fe7ee:1524:39)
    at http://localhost:3000/packages/blaze.js?hash=7abafff7bd98fa1fc0a6478fb26dd08cdd3fe7ee:1875:20
    at Function.Template._withTemplateInstanceFunc (http://localhost:3000/packages/blaze.js?hash=7abafff7bd98fa1fc0a6478fb26dd08cdd3fe7ee:3683:12)
    at http://localhost:3000/packages/blaze.js?hash=7abafff7bd98fa1fc0a6478fb26dd08cdd3fe7ee:1873:29
    at Object.Blaze._withCurrentView (http://localhost:3000/packages/blaze.js?hash=7abafff7bd98fa1fc0a6478fb26dd08cdd3fe7ee:2214:12)
    at viewAutorun (http://localhost:3000/packages/blaze.js?hash=7abafff7bd98fa1fc0a6478fb26dd08cdd3fe7ee:1872:18)

I checked and re-checked the autoform code. Also pasted your exact code... But still the issue is there!

[sjkdev21]

Having the same issue