ErrorCode < ERRCA0021>:SubStatus < ES0001>:Server collection cannot be empty

ErrorCode<ERRCA0021>:SubStatus<ES0001>:Server collection cannot be empty
This could be caused by incorrect configuration.
I was using caching preview and in my case it was a configuration error
  <dataCacheClients>
       <dataCacheClient name="default">
         <autoDiscover isEnabled="false" identifier="VideoDeals" />
       </dataCacheClient>
   </dataCacheClients>
I changed isEnabled to "true" and it worked!