Issue in decrypting data using gpg

I have got gpg installed in my IS and keys created
in this location:C:\GnuPG\gpg.exe

My openpgp properties file is set:

Integration Server keyring directory. You must create this outside of the IS

using gpg --gen-key, etc. This directory must be protected carefully by

O/S permissions.

pgp.home=C:\GnuPG,…so on

While decrypting data(invoking a java service ,where the commands are set and exceuted)

I am geting flollowing error:

gpg: encrypted with RSA key, ID C8493849
gpg: decryption failed: secret key not available

Please help in getting this resolved…Thank You in advance:)