Hi Saravanaprasad_k,
Could you check if a few lines above the message, you find something like “Permissions on {keyfile-path} are too open.”
If that’s the case, then you just need to set the mode:
chmod 400 {keyfile-path}
It is stated that the keyfile should not be group and world visible (hence need the 400 mode in Linux/Unix).
Let me know if this works.