General-glo-ciphering implementation

Hi,
First of all I thank you for this simple and functional library, I was able to establish AA connection and I got successfully uncyphered objects with Public Client like Logical Device Name and Invocation Counter.
Now I have an issue to make a ciphered message with Management Client, this is my client:

secureClient = new GXDLMSSecureClient(true, 1, 1, Authentication.LOW, null, InterfaceType.WRAPPER);
secureClient.getCiphering().setSecurity(Security.AUTHENTICATION_ENCRYPTION);
secureClient.getCiphering().setSystemTitle(GXCommon.hexToBytes(CLIENT_SYSTEM_TITLE));
secureClient.getCiphering().setSecuritySuite(SecuritySuite.AES_GCM_128);
secureClient.getCiphering().setBlockCipherKey(GXCommon.hexToBytes(KEY_C));
secureClient.getCiphering().setAuthenticationKey(GXCommon.hexToBytes(KEY_C));
secureClient.getCiphering().setInvocationCounter(Long.parseLong(invocationCounter, 16));
secureClient.getNegotiatedConformance().add(Conformance.GENERAL_PROTECTION);

When I send a ciphered get-message to the meter, I don't obtain any response. I sent the message created from your library to the vendor of the meter, and he say me that all parameters I set are correct but I'm wrong about the kind of encryption, because I have to use general-glow-ciphering.

How can I set this type of encryption?
Thanks a lot.