Problems with "CreateHeadset" method

Dear friends,

I get an error when I call the CreateHeadset method of
org.bluez.audio.Manager interface by using the C sentences:

char *headset;
dbus_g_proxy_call(audio, "CreateHeadset", &error, G_TYPE_STRING,
"00:16:94:03:60:1B", G_TYPE_INVALID, G_TYPE_STRING, &headsetPath,
G_TYPE_INVALID);

The error message is:

Method "CreateHeadset" with signature "s" on interface
"org.bluez.audio.Manager" doesn't exist

but I read that there is a method "string CreateHeadset(string address)" in
the audio api.

Can anyone help me?

Thank you very much.
Pedro

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