title: Invariant Violation: Element type is invalid: expected a string
body: <p>I'm having this issue with ui kitten kit library, it works fine with regular but throw this error when I'm passing props. I tried to change my import / exports method with no luck. can please someone help figure it out.</p>
  
  <pre><code>import { RkTheme, RkButton, RkCard, RkText, rkCardContent, rkCardImg, rkCardFooter, } from 'react-native-ui-kitten';
  
  ...
  
  export default class AutocompleteExample extends Component {
  render() {
    return (
    &lt;Content /&gt;
      &lt;RkCard&gt;
    &lt;View rkCardHeader&gt;
      &lt;Text&gt;Header&lt;/Text&gt;
    &lt;/View&gt;
    &lt;Image rkCardImg source={{uri: this.state.img}}/&gt;
    &lt;View rkCardContent&gt;
      &lt;Text&gt;quick brown fox&lt;/Text&gt;
    &lt;/View&gt;
    &lt;View rkCardFooter&gt;
      &lt;Text&gt;{this.state.price}&lt;/Text&gt;
    &lt;/View&gt;
  &lt;/RkCard&gt;
  
   )
  }
  
  module.exports = AutocompleteExample
  </code></pre>
  
  <p>this.state.img works well and I'm able to see the picture however this.state.price do not work, if replace it with a regular text it works. Thanks.</p>