I tried this "walletpassphrase YOUR_PASSWORD 9999999 true" in console but says error. Also I Have not set any password as there is no conf file in there. What should I do in order to get minting
Firstly, letting us know the error would help.
I'm assuming the error is stating you haven't set a password and therefore you can't unlock the wallet as it's already unlocked.
You must be one brave MOFO to leave your wallet unencrypted!