如何允许客人用wordpress默认媒体上传器上传图片

我正在创建一个wordpress插件，我需要让客人能够上传图像，我的媒体上传器成功打开，但在上传照片时显示错误。我的代码在下面，

这是我的php代码

add_action('wp_enqueue_scripts', 'my_admin_scripts');
function my_admin_scripts()
{
wp_enqueue_media();
wp_register_script('my-admin-js', WP_PLUGIN_URL . '/foldername/js/call_media_uploader.js', array('jquery'));
wp_enqueue_script('my-admin-js');
}

这是jquery代码

jQuery(document).ready(function(jQuery){

var custom_uploader;

jQuery('#upload_image_button').click(function(e) {
    e.preventDefault();
    //If the uploader object has already been created, reopen the dialog
    if (custom_uploader) {
        custom_uploader.open();
        return;
    }
    //Extend the wp.media object
    custom_uploader = wp.media.frames.file_frame = wp.media({
        title: 'Choose Image',
        button: {
            text: 'Choose Image'
        },
        multiple: false
    });
    //When a file is selected, grab the URL and set it as the text field's value
    custom_uploader.on('select', function() {
        attachment = custom_uploader.state().get('selection').first().toJSON();
        jQuery('#upload_image').val(attachment.url);
    });
    //Open the uploader dialog
    custom_uploader.open();
});

});

请告诉我如何使用wordpress默认媒体上传器上传图像。