This message is part of the retry mechanism of brainCloud. The error code is 40605 = MISSING_LAST_PACKET_RESPONSE .
If the brainCloud client times out without receiving a response from the server, it will automatically retry for you.
During a retry - one of three things will normally happen:
- The system may be still processing the request - in which case it will respond with PACKET_IN_PROGRESS (and the client will automatically retry again) 
- The system may have completed processing the request, and your client somehow missed the response. The good news is for that case we cache the response - and so the server will just return the cached response - like everything is normal. 
- In the third case, the client for some reason didn't receive the response - but the server was also unable to cache the response, because the response was too large - so you receive the MISSING_LAST_PACKET_RESPONSE error. 

