Hi
i try to use my own shortcode by this example here.
Now i try to add a list-feature, but this not work.
My Code:

<?php
/**
 * Featurebox
 * 
 * Shortcode which creates a text element wrapped in a div
 */
if ( ! defined( 'ABSPATH' ) ) {  exit;  }    // Exit if accessed directly

if ( !class_exists( 'avia_sc_olicci_featurebox' ) )
{
	class avia_sc_olicci_featurebox extends aviaShortcodeTemplate
	{
			/**
			 * Create the config array for the shortcode button
			 */
			function shortcode_insert_button()
			{
				$this->config['self_closing']	=	'no';
				
				$this->config['name']			= __('Feature Box', 'avia_framework' );
				$this->config['tab']			= __('Content Elements', 'avia_framework' );
				$this->config['icon']			= AviaBuilder::$path['imagesURL']."sc-contentslider.png";
				$this->config['order']			= 1;
				$this->config['target']			= 'avia-target-insert';
				$this->config['shortcode'] 		= 'av_olicci_featurebox';
				$this->config['shortcode_nested'] = array('av_olicci_featureitem');
				$this->config['tooltip'] 	    = __('Create an olicci Feature Box Element', 'avia_framework' );
				$this->config['preview'] 		= true;
				$this->config['modal_data']		= array('modal_class' => 'mediumscreen');
			}

			/**
			 * Popup Elements
			 *
			 * If this function is defined in a child class the element automatically gets an edit button, that, when pressed
			 * opens a modal window that allows to edit the element properties
			 *
			 * @return void
			 */
			function popup_elements()
			{
				$this->elements = array(
					
					array(
							"type" 	=> "tab_container", 'nodescription' => true
						),
						
					array(
							"type" 	=> "tab",
							"name"  => __("Content" , 'avia_framework'),
							'nodescription' => true
						),
					array(
						"name" => __("Heading", 'avia_framework'),
						'desc' => __('Trage hier die Headline ein','olicci'),
						'id' => 'heading',
						'type' => 'input',
						'std' => 'Adserver'
					),
					array(
						"name" => __("Subheading","avia_framework"),
						"desc" => __("Add an extra descriptive subheading below the actual heading","avia_framework"),
						"id" => "subheading",
						"type" => "input",
						"std" => ""
					),
					array(
							"name" 	=> __("Content",'avia_framework' ),
							"desc" 	=> __("Enter some content for this textblock",'avia_framework' ),
							"id" 	=> "content",
							"type" 	=> "textarea",
							"std" 	=> __("Click here to add your own text", "avia_framework" )
							),
					array(	"name" 	=> __("Adserver Auswahl", 'olicci' ),
							"desc" 	=> __("Trage hier die Adserver ein, in denen das Feature enthalten ist", 'olicci' ),
				            "id" 	=> "adserver",
				            "type" 	=> "modal_group",
				            "modal_title" => __("Edit List Item", "avia_framework"),
				            "std" => array(
				            	array('title' => 'Display AdServer','color' => "#400954", "link" => "")
				            ),
				            "subelements" => array(
				            	array(
				            		"name" => "AdServer Titel",
				            		"desc" => "Der Titel des AdServers",
				            		"id" => "title",
				            		"std" => "Adnetwork",
				            		"type" => "input"
				            	),
				            	array(
				            		"name" => "Link",
				            		"desc" => "Link zur Adserver Beschreibung",
				            		"id" => "link",
				            		"type" => "linkpicker",
				            		"fetchTMPL" => true,
				            		"std" => "",
				            		"subtype" => array(
				            			__('No Link', 'avia_framework' ) =>'',
                                        __('Set Manually', 'avia_framework' ) =>'manually',
                                        __('Single Entry', 'avia_framework' ) =>'single',
                                        __('Taxonomy Overview Page',  'avia_framework' )=>'taxonomy',
				            		)
				            	),
				            	array(
				            		"name" => "Kreis-Farbe",
				            		"desc" => "Farbe des Kreises des Elements",
				            		"id" => "link_color",
				            		"type" => "colorpicker",
				            		"std" => "",
				            	)
				            )
				        ),

					array(
							"type" 	=> "close_div",
							'nodescription' => true
						),
					
					array(
							"type" 	=> "tab",
							"name"	=> __("Screen Options",'avia_framework' ),
							'nodescription' => true
						),
					
							array(
								"name" 	=> __("Element Visibility",'avia_framework' ),
								"desc" 	=> __("Set the visibility for this element, based on the device screensize.", 'avia_framework' ),
								"type" 	=> "heading",
								"description_class" => "av-builder-note av-neutral",
								),
							
							array(	
									"desc" 	=> __("Hide on large screens (wider than 990px - eg: Desktop)", 'avia_framework'),
									"id" 	=> "av-desktop-hide",
									"std" 	=> "",
									"container_class" => 'av-multi-checkbox',
									"type" 	=> "checkbox"),
							
							array(	
								
									"desc" 	=> __("Hide on medium sized screens (between 768px and 989px - eg: Tablet Landscape)", 'avia_framework'),
									"id" 	=> "av-medium-hide",
									"std" 	=> "",
									"container_class" => 'av-multi-checkbox',
									"type" 	=> "checkbox"),
									
							array(	
								
									"desc" 	=> __("Hide on small screens (between 480px and 767px - eg: Tablet Portrait)", 'avia_framework'),
									"id" 	=> "av-small-hide",
									"std" 	=> "",
									"container_class" => 'av-multi-checkbox',
									"type" 	=> "checkbox"),
									
							array(	
								
									"desc" 	=> __("Hide on very small screens (smaller than 479px - eg: Smartphone Portrait)", 'avia_framework'),
									"id" 	=> "av-mini-hide",
									"std" 	=> "",
									"container_class" => 'av-multi-checkbox',
									"type" 	=> "checkbox"),
							
							
							array(
								"name" 	=> __("Font Size",'avia_framework' ),
								"desc" 	=> __("Set the font size for the element content, based on the device screensize.", 'avia_framework' ),
								"type" 	=> "heading",
								"description_class" => "av-builder-note av-neutral",
								),
								
							
							
								
							array(	"name" 	=> __("Font Size for medium sized screens (between 768px and 989px - eg: Tablet Landscape)", 'avia_framework' ),
				            "id" 	=> "av-medium-font-size",
				            "type" 	=> "select",
				            "subtype" => AviaHtmlHelper::number_array(10,60,1, array( __("Default", 'avia_framework' )=>''), "px"),
				            "std" => ""),
				            
				            array(	"name" 	=> __("Font Size for small screens (between 480px and 767px - eg: Tablet Portrait)", 'avia_framework' ),
				            "id" 	=> "av-small-font-size",
				            "type" 	=> "select",
				            "subtype" => AviaHtmlHelper::number_array(10,60,1, array( __("Default", 'avia_framework' )=>''), "px"),
				            "std" => ""),
				            
							array(	"name" 	=> __("Font Size for very small screens (smaller than 479px - eg: Smartphone Portrait)", 'avia_framework' ),
				            "id" 	=> "av-mini-font-size",
				            "type" 	=> "select",
				            "subtype" => AviaHtmlHelper::number_array(10,60,1, array( __("Default", 'avia_framework' )=>''), "px"),
				            "std" => ""),
					
						
					array(
							"type" 	=> "close_div",
							'nodescription' => true
						),	
					
						
					array(
							"type" 	=> "close_div",
							'nodescription' => true
						),
				);

			}

			/**
			 * Editor Sub Element - this function defines the visual appearance of an element that is displayed within a modal window and on click opens its own modal window
			 * Works in the same way as Editor Element
			 * @param array $params this array holds the default values for $content and $args.
			 * @return $params the return array usually holds an innerHtml key that holds item specific markup.
			 */
			function editor_sub_element($params)
			{
				$template = $this->update_template("title", __("Element", 'avia_framework' ). ": {{title}}");

				//extract(av_backend_icon($params)); // creates $font and $display_char if the icon was passed as param "icon" and the font as "font"

				$params['innerHtml']  = "";
				$params['innerHtml'] .= "<div class='avia_title_container'>";
				$params['innerHtml'] .= "<span>";//"<span ".$this->class_by_arguments('font' ,$font).">";
				//$params['innerHtml'] .= "<span data-update_with='icon_fakeArg' class='avia_tab_icon'>".$display_char."</span>";
				$params['innerHtml'] .= "</span>";
				$params['innerHtml'] .= "<span {$template} >".__("Element", 'avia_framework' ).": ".$params['args']['title']."</span></div>";

				return $params;
			}

			/**
			 * Editor Element - this function defines the visual appearance of an element on the AviaBuilder Canvas
			 * Most common usage is to define some markup in the $params['innerHtml'] which is then inserted into the drag and drop container
			 * Less often used: $params['data'] to add data attributes, $params['class'] to modify the className
			 *
			 *
			 * @param array $params this array holds the default values for $content and $args.
			 * @return $params the return array usually holds an innerHtml key that holds item specific markup.
			 */
			function editor_element($params)
			{
				$params['class'] = "";
				$params['innerHtml'] = "<div class='avia_featurebox avia_textblock_style' data-update_with='content'>".stripslashes(wpautop(trim(html_entity_decode( $params['content']) )))."</div>";
				return $params;
			}

			/**
			 * Frontend Shortcode Handler
			 *
			 * @param array $atts array of attributes
			 * @param string $content text within enclosing form of shortcode element
			 * @param string $shortcodename the shortcode found, when == callback name
			 * @return string $output returns the modified html string
			 */
			function shortcode_handler($atts, $content = "", $shortcodename = "", $meta = "")
			{
				extract(AviaHelper::av_mobile_sizes($atts)); //return $av_font_classes, $av_title_font_classes and $av_display_classes 

				extract(shortcode_atts(array(
				'font_color' => "",
				'color' => '',
				'size' => '',
				
				), $atts, $this->config['shortcode']));
				
				
				$custom_class = !empty($meta['custom_class']) ? $meta['custom_class'] : "";
                $output = '';
                $markup = avia_markup_helper(array('context' => 'entry','echo'=>false, 'custom_markup'=>$meta['custom_markup']));
                $markup_text = avia_markup_helper(array('context' => 'entry_content','echo'=>false, 'custom_markup'=>$meta['custom_markup']));

				$output .= "<!-- ";
				$output .= var_export([$atts,$content],true);
				$output .= "-->\n";
                $output .= '<section class="av_featurebox_section">';// '.$markup.'>';
                $output .= '<div class="olicci-sign">';
                $output .= '<img src="'.trailingslashit(get_stylesheet_directory_uri()).'img/olicci-sign-30x30.png" alt="" />';
                $output .= '</div>';
                $output .= '<div class="title">';
                $output .= "<h4>".$atts['heading']."</h4>";
                $output .= "<h6>".$atts['subheading']."</h6>";
                $output .= "</div>";
                //$output .= "<div class='avia_textblock {$custom_class}' {$markup_text}>".ShortcodeHelper::avia_apply_autop(ShortcodeHelper::avia_remove_autop($content) )."</div>";
                $output .= "<div class='avia_textblock {$custom_class}'>".ShortcodeHelper::avia_apply_autop(ShortcodeHelper::avia_remove_autop($content) )."</div>";
                $output .= "<div class='avia_footer'>";
                $output .= "</div>";
                $output .= '</section>';

                return $output;
			}
			function av_olicci_featureitem($atts, $content = "", $shortcodename = "")
			{
				
				//extract($this->screen_options); //return $av_font_classes, $av_title_font_classes and $av_display_classes
				
                $atts =  shortcode_atts(array('title' => '', 'link' => '', 'link_color' => ''), $atts, 'av_olicci_featureitem');

                $output = "";
                $output = "<a href='".esc_url($atts['link'])."' class='tooltip' data-tooltip='".esc_attr($atts['title'])."'>";
                $output .= "<div class='circle' style='background-color: ".esc_attr($atts['link_color'])."'></div>";
                $output .= "</a>";
                /*
				$output  = "";
				$output .= "<li>";
				$output .= 		"<{$display_char_wrapper['start']} {$this->icon_html_styling} class='iconlist_icon  avia-font-".$atts['font']."'><span class='iconlist-char '></span></{$display_char_wrapper['end']}>";
                $output .=          '<article class="article-icon-entry '.$contentClass.'" '.avia_markup_helper(array('context' => 'entry','echo'=>false, 'custom_markup'=>$atts['custom_markup'])).'>';
				$output .=              "<div class='iconlist_content_wrap'>";
                $output .=                  '<header class="entry-content-header">';
                $markup = avia_markup_helper(array('context' => 'entry_title','echo'=>false, 'custom_markup'=>$atts['custom_markup']));
				if(!empty($atts['title'])) $output .="<{$title_el} class='av_iconlist_title iconlist_title{$iconlist_title} {$this->title_class} {$av_title_font_classes}' {$markup} {$this->title_styling}>".$atts['title']."</{$title_el}>";
                $output .=                  '</header>';
                $markup = avia_markup_helper(array('context' => 'entry_content','echo'=>false, 'custom_markup'=>$atts['custom_markup']));
				$output .=                  "<div class='iconlist_content {$this->content_class} {$av_font_classes}' {$markup} {$this->content_styling}>".ShortcodeHelper::avia_apply_autop(ShortcodeHelper::avia_remove_autop( $content ) )."</div>";
                $output .=              "</div>";
                $output .=              '<footer class="entry-footer"></footer>';
                $output .=          '</article>';
				$output .=      "<div class='iconlist-timeline'></div>";
				$output .= "</li>";
                */

				return $output;
			}

	}
}

That outputted:

<p>‚ av-medium-font-size=“ av-small-font-size=“ av-mini-font-size=“ av_uid=’av-3590‘ admin_preview_bg=“]<br>
Affiliate AdServer ist mit einem innovativen Feature ausgestattet, durch das der Betreiber Aufgaben auf verschiedene Manager verteilen kann. Jeder Manager erhält einen eigenen Account, mit dem er verschiedene Inventare verwalten oder Aufgaben wie die Prüfung von Werbemitteln ausführen kann.</p>

How i can add the list-feature to my element (every list-item needs a title, link and a color, not more)?

Thanks,
Stefan