Issue while sending data from 2nd node to 1st node while rfm69 communication.

In testing RFM69HCW Hookup Guide - sending data from the second node to first node(sending data from the first node to second node no issue) while there is " no ACK received" received by the second node at the time of sending data first node print that data 3 times and also prints " ACK sent" . This is not issued while sending data from the fist node and get " no ACK received" there. At this time i do not receive that data 3 times(receive nothing on receive node(2nd node) ). This is issued while sending data from the 2nd node to the first node. What do i do so that data send and received on the first node successfully? How do i solve this issue?