Strict Standards wordpress error in debug mode

UPDATED:
The developer contacted me and explained me more about the error. Really appreciate his effort, looking forward to a paid version if rolled out.
Strict Standards: call_user_func() expects parameter 1 to be a valid callback, non-static method WooCommerceProductsCarouselAllInOneShortcodeDecode::initialize() should not be called statically in /home/content/p3pnexwpnas03_data02/06/2466706/html/wp-includes/shortcodes.php on line 286