删除时内部服务器错误 - Contao

Question

我是初学者。我创建了一个后端自定义模块。记录列表看起来很好。但是当我试图删除或复制记录时，系统返回内部服务器错误。也无法编辑预先保存的记录。下面附有截图。请帮助我。

// List
    'list' => array
    (
        'sorting' => array
        (
            'mode'                    => 1,
            'fields'                  => array('title'),
            'flag'                    => 1,
            'panelLayout'             => 'filter;search,limit'
        ),
        'label' => array
        (
            'fields'                  => array('title', 'teaser'),
            'format'                  => '%s <span style="color:#b3b3b3;padding-left:3px;">[%s]</span>'
        ),
        'global_operations' => array
        (
            'all' => array
            (
                'label'               => &$GLOBALS['TL_LANG']['MSC']['all'],
                'href'                => 'act=select',
                'class'               => 'header_edit_all',
                'attributes'          => 'onclick="Backend.getScrollOffset()" accesskey="e"'
            )
        ),
        'operations' => array
        (

            'editheader' => array
            (
                'label'               => &$GLOBALS['TL_LANG']['tl_solutions']['editheader'],
                'href'                => 'act=edit',
                'icon'                => 'edit.gif'
            ),
            'copy' => array
            (
                'label'               => &$GLOBALS['TL_LANG']['tl_solutions']['copy'],
                'href'                => 'act=copy',
                'icon'                => 'copy.gif'
            ),
            'delete' => array
            (
                'label'               => &$GLOBALS['TL_LANG']['tl_solutions']['delete'],
                'href'                => 'act=delete',
                'icon'                => 'delete.gif',
                'attributes'          => 'onclick="if(!confirm(\'' . $GLOBALS['TL_LANG']['MSC']['deleteConfirm'] . '\'))return false;Backend.getScrollOffset()"'
            ),
            'show' => array
            (
                'label'               => &$GLOBALS['TL_LANG']['tl_solutions']['show'],
                'href'                => 'act=show',
                'icon'                => 'show.gif'
            )
        )
    ),