title: Error "Missing '}' or object member name" in Google SDTT
body: <p>I've below JSON LD data:</p>
  
  <pre><code>&lt;script type="application/ld+json"&gt;
  {
    "@context": "http://schema.org", 
    "@type": "NewsArticle", 
    "mainEntityOfPage": {
        "@type": "WebPage",
        "@id": "http://healthypets.mercola.com/sites/healthypets/archive/2017/01/25/dog-foods-contain-high-fluoride-levels.aspx"
    },
    "headline": "80 Percent of Tested Dog Foods Contain High Fluoride Levels", 
    "datePublished": "2017-01-25T12:00:00Z", 
    "dateModified": "1/18/2017 7:28:27 PM", 
    "description": "A study found that 8 out of 10 dog food brands contained fluoride 2.5 times higher than the EPA national drinking water standard.", 
    "author": { 
        "@type": "Person", 
        "name": "Dr. Becker", 
    },
    "publisher": { 
        "@type": "Organization", 
        "name": "Mercola.com", 
        "logo": { 
            "@type": "ImageObject", 
            "url": "http://media.mercola.com/themes/healthypets/images/healthypets-logo-responsive.png", 
            "width": 600, 
            "height": 60 
        }
    }, 
    "image": { 
        "@type": "ImageObject", 
        "url": "http://media.mercola.com/themes/healthypets/images/healthypets-logo-responsive.png", 
        "width": 2000,
        "height": 800 
    }
  }
  &lt;/script&gt;
  </code></pre>
  
  <p>Please see below error: </p>
  
  <p><a href="https://i.stack.imgur.com/3SYF5.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/3SYF5.jpg" alt="Google SDTT output"></a></p>
  
  <p>I get the error stating that </p>
  
  <blockquote>
    <p>Missing '}' or object member name.</p>
  </blockquote>