Structured-data throws error for the publisher and image

There is a parent span including two itemtypes as below:

<span itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
        <meta itemprop="name" content="@Model.Brand.Name" />
        <span itemprop="logo" itemscope itemtype="http://schema.org/ImageObject">
            <link itemprop="url" href="@string.Format(Model.Brand.BrandAssetUrlPath+"{0}", "images/brand-logo-colored.png")" />
        </span>
    </span>

I am getting the errors for LOGO and IMAGE which is : (MISSING_FIELD_WITHOUT_TYPE)

I thought it could be because of wrapping the whole code within

itemtype="http://schema.org/Organization"

I removed that from the parent span but still not working.