title: TrueTime Flutter
body: <p>I am implementing true time flutter library <a href="https://pub.dartlang.org/packages/true_time" rel="nofollow noreferrer">https://pub.dartlang.org/packages/true_time</a></p>
  
  <p>Getting an error </p>
  
  <pre><code>W/DiskCacheClient(26153): Cannot use disk caching strategy for TrueTime.
  
   CacheInterface unavailable
  D/TrueTimeRx(26153): ---- resolving ntpHost : ntp.google.com
  W/DiskCacheClient(26153): Cannot use disk caching strategy for TrueTime. CacheInterface unavailable
  E/MethodChannel#true_time(26153): Failed to handle method call
  E/MethodChannel#true_time(26153): java.lang.IllegalStateException: You need to call init() on TrueTime at least once.
  </code></pre>
  
  <p>I get this error with a copy of the code from the readme linked to above.</p>