slider does not work

https://www.monsrilanka.com/ I have been to Appearence / Adventurous 3.3 / Slider I set 4 different images but apparently theme does not consider those images but somehing hardcoded somewhere just showing only 1 image as soucr code display : view-source:https://www.monsrilanka.com/ <img width="1600" height="600" src="https://www.monsrilanka.com/wp-content/uploads/2017/10/slider-leopards-yala.jpg" Also wordpress 5.2 sent a msg reporting an issue here : (https://www.monsrilanka.com/wp-admin/customize.php?theme=adventurous_17&return=https%3A%2F%2Fwww.monsrilanka.com%2Fwp-admin%2Fthemes.php) With error : Une erreur de type E_COMPILE_ERROR a été causée dans la ligne 307 du fichier /home/monsrilanka/public_html/wp-content/themes/adventurous_17/functions.php. Message d’erreur : require(): Failed opening required '/home/monsrilanka/public_html/wp-content/themes/adventurous_17/inc/adventurous-custom-header.php' (include_path='.:/opt/cpanel/ea-php56/root/usr/share/pear') WordPress version 5.4 Thème actuel : Adventurous (version 3.0.2) Extension actuelle : (version ) PHP version 5.6.40