I am the owner of whatsapp group and i am not receiving messages of a specific member and member also not receiving messages by me ...

I am the owner of whats app group and i am not receiving messages of a specific member and member also not receiving messages by me and all other members have no issue and they receiving every thing i post or a specific person posts in that group ... what is this issue and how it can be resolved ??? please answer me on facebook:
facebook.com/barbie.dolly.982292