How to use the carousel built in function

I found this. defaults options.

$defaults = array(
                                    'id'						=> 'exhibition_carousel',				// If you want to have multiple carousels, you will want to change the id each time
                                    'image_size'				=> 'golden-ratio-1024',					// [ thumbnail | medium | large | full | custom ] - the image size you wish to output
                                    'render_controls'			=> true,								// [ true | false ] - Show the slide left right controls
                                    'render_indicators'			=> true 								// [ true | false ] - Show the slide indicators
                                );

                                exhibition_render_bootstrap( $post_id, $defaults );

But still doesn´t show anything.