08904ba8__in_Ruby__Python_and_C_Clients__What_should_the_client_do_
[Error Code Received] LCB_DELTA_BADVAL [What does it mean?] The operation cannot be executed with the requested arguments. [What should the client do?] 
Check the arguments and the operation executing on the arguments. For example: Incrementing a non-numeric value using the incr or incrementing by a non-numeric value
Handling Runtime Errors in Ruby, Python and C Clients
What should the client do?