Clone group not working ?

Hi.
I have created a group. Shouldn't I be able to clone?

 $meta_boxes[] = array(
        'title'  => 'Divart Slider',
        'post_types' => ['divart_slider'],
        
             'columns' => array(
            'column-1' => 8,                   // Simply define the size of the column (from 1 to 12)
            'column-2' => 4,               
               
            
            
        ),
                
        'fields' => array(
            array(
                'id'     => 'disliders',
                // Group field
                'type'   => 'group',
                // Clone whole group?
                'clone'  => true,
                // Drag and drop clones to reorder them?
                'sort_clone' => true,
                // Sub-fields
                'collapsible' => true,
                'group_title' => 'Slide {#}', // ID of the subfield
                'save_state' => true,
                
                'fields' => array(
                
                
                    
                     array(
                     'placeholder' => 'Background Image',
                     
                      'id'               => 'bgimg',
                      'type' => 'file_input',
                       'column'  => 'column-1',
        
                ),  
                array(
                        'placeholder' => 'Gradient Rotate (0 - 360max)',  
                        'id'   => 'grrotate',
                        'type' => 'text',
                        'column'  => 'column-2',
                    ),  
                 array(
                     
                      'id'               => 'bgcolor',  
                      'type'             => 'color',
                      'alpha_channel' => true,       
                    'column'  => 'column-1',                   
        
                ),  
//etc