It took me 24hr waiting for the coin to mature.
After it mature and start staking, few hours later I received the rewards.
The problem is after I received the rewards (new coin), my wallet will turn "you got no mature coin for staking"
Why?
Thanks.
once you get a reward on pos your existing coins are totaled with the reward you received which is then divided into 2 inputs and thus became immature.
They will require 24 hrs to get mature again and i will start staking .