经过Pyro CMS后的问题

Question

一位朋友要我将他的网站（Pyro CMS）移到我的服务器上 我做了一个备份，然后上传所有文件和SQL文件。但在此之后，当我试图进入网站时，会出现此错误：

**A PHP Error was encountered
Severity: Notice
Message: Undefined property: stdClass::$bootstrap_image
Filename: drivers/Streams_parse.php
Line Number: 101**

这些行的代码是这样的：

    if ($fields)
    {
        foreach ($fields as $field)
        {
            if (method_exists($this->CI->type->types->{$field->field_type}, 'plugin_override'))
            {
                $content = preg_replace('/\{\{\s?'.$field->field_slug.'\s?/', '{{ streams_core:field row_id="{{ '.
                    $id_name.' }}" stream_slug="'.
                    $stream_slug.'" field_slug="'.$field->field_slug.'" namespace="'.
                    $stream_namespace.'" field_type="'.$field->field_type.'" ', $content);

                $content = preg_replace('/\{\{\s?\/'.$field->field_slug.'\s?\}\}/', '{{ /streams_core:field }}', $content);
            }
        }   
    }