title: Karate - actual value is not a string
body: <p>I am checking for an 'OK' parameter in response but getting above mentioned error. The same code was working with my previous karate version, now I am using 0.9.0 - This might be some issue with my coding, can't figure out.</p>
  
  <p>Response:</p>
  
  <pre><code>"testResponse": {
      "planSummary": {
        "includedServicesList": [
            {
              "some elements goes here": "test"
            }
          ],
        "status": {
          "statusCd": "200",
          "statusTxt": "OK"
        }
     }
  }
  </code></pre>
  
  <p>My Feature File Code:</p>
  
  <pre><code>When method get
  Then status 200
  Then match response contains 'OK'
  </code></pre>
  
  <p>I get <code>expected: 'OK', reason: actual value is not a string</code> error.</p>
  
  <p>I tried with <code>Then match response contains {statusTxt: 'OK'}</code> as well.</p>