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I am new to Google rich snippets and I did some basic research on Google rich snippets and added following code to my site:

<div class='reiew-rating'>
<div itemscope itemtype="http://schema.org/Review">

<div itemprop="itemReviewed" itemscope itemtype="http://schema.org/Thing">
<meta itemprop="name" content=" Interview questions" />
<meta itemprop="description" content=" for entry level/juniors/freshers &amp; experienced/seniors" /><meta itemprop="url" content="" />
 <span itemprop="author" itemscope itemtype="http://schema.org/Person">
 <meta itemprop="name" Content="Suresh babu mamidala">
 </span>
<img id="6_1" src="http://callinterview.com/images/rating_full.png" alt="rating_1" data-rat="1" >
<img id="6_2" src="http://callinterview.com/images/rating_full.png" alt="rating_2" data-rat="2" >
<img id="6_3" src="http://callinterview.com/images/rating_full.png" alt="rating_3" data-rat="3" >
<img id="6_4" src="http://callinterview.com/images/rating_full.png" alt="rating_4" data-rat="4" >
<img id="6_5" src="http://callinterview.com/images/rating_avg.png" alt="rating_5" data-rat="5" >

</div>

 <div property="aggregateRating" typeof="AggregateRating">
 <span property="ratingValue">4.5</span>

 <meta property="bestRating" content="5"/>
 <meta property="worstRating" content="1"/>
 based on <span property="ratingCount">7869</span> ratings
 </div>
 <span itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
 <meta itemprop="name" content="Callinterview.com">


</div>
</div>

When I test it in the Google structured data testing tool, I am facing following error/s:

The property author is not recognized by Google for an object of type Thing.

A value for the author field is required.

How to solve this?

You add the author property to the Thing:

<div itemprop="itemReviewed" itemscope itemtype="http://schema.org/Thing">
 <!-- … -->
 <span itemprop="author" itemscope itemtype="http://schema.org/Person">
 <!-- … -->
 </span>
</div>

But the author property is not defined for the Thing type.

If it’s the author of the Review, you have to make sure not to nest it under a different itemscope, e.g.:

<div itemprop="itemReviewed" itemscope itemtype="http://schema.org/Thing">
 <!-- … -->
</div>

<span itemprop="author" itemscope itemtype="http://schema.org/Person">
 <!-- … -->
</span>