SDTT gives error "The review has no reviewed item specified", but I'm using the 'itemReviewed' property

I tried itemReviewed in different tags but it's not working, and still showing the error:

The review has no reviewed item specified.

https://search.google.com/structured-data/testing-tool/u/0/#url=https%3A%2F%2Fasphaltthemes.com scan.

<!-- testimonial start-->
<section class="new_new_testi" itemprop="review" itemscope itemtype="http://schema.org/Review" >
    <div class="testi_wrap">

        <div class="new_new_testimonial_one">
            <img itemprop="image" src="https://asphaltthemes.com/wp-content/uploads/2017/06/lady.jpg" alt="Tar Pro WordPress theme customer testimonial">
        </div>

        <div class="new_new_testimonial_two" itemtype="http://schema.org/Product">
            <cite itemprop="reviewBody" itemprop="itemReviewed">Thank you for the wonderful customer service you provided! I was anxious about getting my website launched, and had several questions that you answered for me quickly and thoroughly. In a time where quality customer service seems to be a rarity, you stood out. I know that if I have to reach out to you about anything regarding my site in the future, you will be there to assist me almost immediately. THANK YOU!
            </cite>
            <p itemprop="author">- Laura Byrne / <a itemprop="url" target="_blank" href="https://www.facebook.com/LauraByrneStudios">Laura Byrne Studios</a></p>    
        </div>

    </div>
</section>
<!-- testimonial END -->

<!-- testimonial start-->
<div class="customer_testimoinal cst_test" itemprop="review" itemscope itemtype="http://schema.org/Review" >
    <cite itemprop="reviewBody" itemtype="http://schema.org/Product" itemprop="itemReviewed">Love this theme! Very easy to set up and customize, a LOT of great features – especially for the home page. Every request or question I’ve had has been addressed within 24 hours of sending an email, and the responses have been very helpful.</cite>
 <div>
    <img itemprop="image" src="https://asphaltthemes.com/wp-content/uploads/2017/06/KcvanHout-300x260-1-1.jpg" alt="Tar Pro WordPress theme customer testimonial">
 </div>
 <p>- <a itemprop="author" itemprop="url" href="https://wordpress.org/support/topic/great-super-responsive-to-requests/">Kelly Vanhout</a></p>
</div>
<!-- testimonial END -->

Any idea how to solve this?

You are using two itemprop attributes on the same element (which is not allowed), and you are missing the itemscope attribute (if you use the itemtype attribute):

<cite itemprop="reviewBody" itemtype="http://schema.org/Product" itemprop="itemReviewed">

<cite itemprop="reviewBody" itemprop="itemReviewed">

What you want instead is something like this:

<div itemprop="itemReviewed" itemscope itemtype="http://schema.org/Product">
  <!-- an item value; you can use properties (itemprop) inside this 'div' -->
</div>

<p itemprop="reviewBody">
  <!-- a text value -->
</p>