LinuxQuestions.org - G2ipmsg error

I use ipmsg in windows to communicate with users in LAN.

But now I am using CentOS 6 in my system and wants to use G2Ipmsg also in linux.

But in G2ipmsg I am able to send message to others but , when other user is sending me message I am getting the error:

Code:

FileName:cryptif.c

Function:ipmsg_decrypt_message

Line:703

Can not decode message: peer = 172.25.121.75, rc = -2

And on user side its saying failed to send message.