幻灯片动画未定义

我在js中遇到以下问题：

未捕获引用错误：未定义幻灯片动画（匿名功能）

指的是：

    function slideshow_animate() {
    if(!animation.auto_animate) return;
    var next_slide = $('.item-slide.active').next();
    if(!next_slide.length) {
        next_slide = $('#item-slide-1');
    }
    next_slide.click();
}

我有另一个网站，如果我在那里工作，但在这个应用程序中，我似乎有幻灯片_动画的问题，附上完整的代码供参考：

(function ($, Drupal) {
Drupal.behaviors.lek7_zen_theme = {
    attach: function(context, settings) {
        $(document).ready(function(){

            var i = 1;
            $('.item-slide').each(function(key, value) {
                $(value).attr('id', 'item-slide-'+i);
                i++;
            });
            $('.slide_caption').hide();
            $('#item-slide-1 > .slide_caption').show();
            $('#item-slide-1').addClass('active');
            $('.item-slide').not('.active').children('.slide_image_slice').show();
        });

        var animation = {
            'auto_animate': true,
            'auto_animate_delay': 8000,
            'auto_animate_id': '',
            'caption_speed': 'fast',
            //'panel_speed': 'slow',
            'panel_speed': 1000,
            'panel_easing': 'easeInOutCubic'
        }
        $('.item-slide')
            .bind('open', function(){
                if(! $(this).hasClass('open')){
                    $(this).next().trigger('open');
                    $(this).addClass('open');
                    $(this).animate({right: "-=769px"}, animation.panel_speed, animation.panel_easing, function(){display_slices();});
                }
                else{
                    $(this).prev().trigger('close');
                }
                $(this).siblings().removeClass('active');
                $(this).addClass('active');
                setTimeout(function(){hide_slices()},1);

                display_caption();
            })
            .bind('close', function(){
                if($(this).hasClass('open')){
                    $(this).removeClass('open');
                    $(this).animate({right: "+=769px"}, animation.panel_speed, animation.panel_easing, function(){display_slices();});
                    $(this).prev().trigger('close');
                }
            });
        $('.item-slide')
            .hoverIntent(
            function() {
                animation.auto_animate = false;
                trigger_accordion($(this));
            },
            function() {
                animation.auto_animate = true;
                clearInterval(animation.auto_animate_id);
                animation.auto_animate_id = setInterval('slideshow_animate()', animation.auto_animate_delay);
            }
        )
            .click(function() {
                trigger_accordion($(this));
            });
        animation.auto_animate_id = setInterval('slideshow_animate()', animation.auto_animate_delay);

function trigger_accordion(itemSlide) {
    if(!(itemSlide.is(':animated'))) {
        itemSlide.trigger('open');
    }
}
function display_caption() {
    $('.slide_caption').each(function() {
        if(!($(this).parent().hasClass('active'))) {
            $(this).fadeOut('fast', function() {
                $('.item-slide.active > .slide_caption').fadeIn(animation.caption_speed);
            });
        }
    });
}
function hide_slices() {
    $('.slide_image_slice').each(function() {
        if($(this).parent().hasClass('active')) {
            $(this).fadeOut('fast');
        }
    });
}
function display_slices() {
    $('.slide_image_slice').each(function() {
        if(!$(this).parent().hasClass('active') && !$(this).is(":visible")) {
            $(this).fadeIn('fast');
        }
    });
}
function slideshow_animate() {
    if(!animation.auto_animate) return;
    var next_slide = $('.item-slide.active').next();
    if(!next_slide.length) {
        next_slide = $('#item-slide-1');
    }
    next_slide.click();
}
    }
};
})(jQuery, Drupal);