08904ba8__in_Ruby__Python_and_C_Clients__What_should_the_client_do_
[Error Code Received] LCB_INVALID_HOST_FORMAT [What does it mean?] The bootstrap host list used an invalid/unsupported format. [What should the client do?] 
Check the hostname format used, correct it and retry.
Handling Runtime Errors in Ruby, Python and C Clients
What should the client do?