'am new with django ckeditor the embed plugin failed to fetch given a url

this is my ckeditor cofigs

CKEDITOR_CONFIGS = { 'special': { 'toolbar': 'Special', 'width': 'auto', 'toolbar_Special': [ ["Format", "Bold", "Italic", "Underline", "Strike", "SpellChecker"], ['NumberedList', 'BulletedList', "Indent", "Outdent", 'JustifyLeft', 'JustifyCenter', 'JustifyRight', 'JustifyBlock'], ["Image", "Table", "Link", "Unlink", "Anchor", "SectionLink", "Embed"], ['Undo', 'Redo'], ["CodeSnippet"], ["Maximize"] ],

    # Remove these dialog tabs (semicolon separated dialog:tab)
    'removeDialogTabs': ';'.join([
        'image:advanced',
        'image:Link',
        'link:upload',
        'table:advanced',
        #'tableProperties:advanced',
        ]),
    
    # Extra plugins to be used in the editor
    'extraPlugins': ','.join([
        'mathjax',  # Used to render mathematical formulae
        'codesnippet',  # Used to add code snippets
        'image2',  # Loads new and better image dialog
        'embed',  # Used for embedding media (YouTube/Slideshare etc)
        'tableresize',  # Used to allow resizing of columns in tables
    ]),
}

}

the error message

is there anything am missing



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