throwing an instance of
 <a href="../retrofit/MockHttpException.html" title="class in retrofit"><code>MockHttpException</code></a>. This should be done for both synchronous and asynchronous methods.
 Do not call the <a href="http://github.com/square/retrofit/retrofit/apidocs/retrofit/Callback.html?is-external=true#failure-retrofit.RetrofitError-" title="class or interface in retrofit"><code>failure()</code></a> method of a callback.</div>
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