Invalid value in itemtype

Good afternoon. I received such a warning in the search-console.
Using the Editorial theme

Invalid value in "itemtype" field
Items with these problems cannot appear as Google advanced search results.

Affected pages:
www.meizer.kz/ru/submeny/kukhni
www.meizer.kz/ru/submeny/ofisnaya
www.meizer.kz/ru/submeny/vannaya

<div class="gallery_container col-4 col-6-medium col-12-small" itemprop="associatedMedia" itemscope itemtype="MediaObject">

I will be grateful for any help

Hi @RobotWerter, I can't see the warning you're referring to in Chrome's inspector. How can I see that warning?

I just noticed below validator shows some uncategorized errors. You can fix those by changing (in all places):

itemscope itemtype="MediaObject"

to:

itemscope itemtype="http://schema.org/MediaObject"

@Karmalakas:
https://validator.schema.org

Thanks @Karmalakas, this is the final solution. I'll fix the item template in Editorial theme as soon as possible.