itemprop, invalid attribute?

HTML Validator error
line 317 column 66 – Error: The itemprop attribute was specified, but the element is not a property of any item.

<div class=”breadcrumb-trail breadcrumbs” itemprop=”breadcrumb”>

In the file \breadcrumb-trail\inc\breadcrumbs.php, line 130.

I think the tag that has the attribute “itemprop” needs to be wrapped in another tag that contains “itemscope”, to pass HTML validators.

http://www.webmonkey.com/2010/09/microdata-html5s-best-kept-secret/

https://ww.wp.xz.cn/plugins/breadcrumb-trail/