Has anyone created a image field in the CMS form popup?

I'm getting this error.

Here is the error. It's happens when I tried to upload a image from the form of the CMS popup, I just did the form exactly like the this tutorial: http://doc.silverstripe.com/doku.php?id=tutorial:5-dataobject-relationship-management

Error:
===================================
ERROR:Error 256: File::loadUploaded() Not passed an array. Most likely, the form hasn't got the right

enctype

At l152 in C:\xampp\htdocs\vancouverlivingdev\sapphire\filesystem\File.php

user_error(File::loadUploaded() Not passed an array. Most likely, the form hasn't got the right enctype

,256)

line 152 of File.php

File->loadUploaded()

line 113 of Image.php

Image->loadUploaded()

line 14 of SimpleImageField.php

SimpleImageField->saveInto(WhatsHotWhatsNOTDataObject)

line 543 of Form.php

Form->saveInto(WhatsHotWhatsNOTDataObject)

line 702 of ComplexTableField.php

ComplexTableField_Popup->saveComplexTableField(Array,ComplexTableField_Popup)

line 197 of Controller.php

Controller->run(Array)

line 76 of Director.php

Director::direct(/admin/)

line 104 of main.php

Code:
======================
   // lists
   function getCMSFields()
   {
      $fields = parent::getCMSFields();

      $tablefield = new HasManyComplexTableField(
         $this,
   'Posts',
   'WhatsHotWhatsNOTDataObject',
         array(
            "Whats" => "Whats HOT Whats NOT",
            'Title' => 'Title',
            'Description' => 'Description',
            'VotesAgree' => 'Votes Agree',
            'VotesDisagree' => 'Votes Disagree',
            'Datetime' => 'Date and time',
            'Active' => 'Active',
            'Offensive' => 'Mark as offensive',
            'Home' => 'Home'
         ),
    'getCMSFields_forPopup'
);

$fields->addFieldToTab( 'Root.Content.Posts', $tablefield );

return $fields;
   }

   // CMS
   function getCMSFields_forPopup()
   {
$o = new FieldSet();
      $o->push(
         new SimpleImageField("Picture", "Image:")
      );

      
      return $o;
   }

I did, but this error is shown:

FATAL ERROR: Bad class to singleton() - WhatsHotWhatsNOTDataObject
At line 78 in C:\xampp\htdocs\vancouverlivingdev\sapphire\core\Core.php

user_error(Bad class to singleton() - WhatsHotWhatsNOTDataObject,256)
line 78 of Core.php

singleton(WhatsHotWhatsNOTDataObject)
line 1504 of DataObject.php

DataObject::get_one(WhatsHotWhatsNOTDataObject,`WhatsHotWhatsNOTDataObject`.`ID` = 1)
line 1594 of DataObject.php

DataObject::get_by_id(WhatsHotWhatsNOTDataObject,1)
line 445 of Image.php

Image_Uploader->linkedObj()
line 460 of Image.php

Image_Uploader->Image()

call_user_func_array(Array,Array)
line 294 of ViewableData.php

ViewableData->obj(Image,,1)
line 948 of ViewableData.php

ViewableData_Customised->obj(Image,,1)
line 20 of .cacheC..xampp.htdocs.vancouverlivingdev.sapphire.templates.Image_iframe.ss

include(C:\Users\rochita\AppData\Local\Temp\silverstripe-cacheC--xampp-htdocs-vancouverlivingdev\.cacheC..xampp.htdocs.vancouverlivingdev.sapphire.templates.Image_iframe.ss)
line 190 of SSViewer.php

SSViewer->process(ViewableData_Customised)
line 228 of Controller.php

Controller->run(Array)
line 76 of Director.php

Director::direct(/images/iframe/WhatsHotWhatsNOTDataObject/1/Picture)
line 104 of main.php
Context
Debug (Debug::showError() in line 149 of Debug.php)

* className =

WhatsHotWhatsNOTDataObject

* _SINGLETONS =
o Member =
Database record: Member
+ ID :

0

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