Transmission and hibernation, .service file missing

[pasqoo]

Hi, when I open Help/Message Log in Transmission, setting Error level, I see this error:

Couldn't inhibit desktop hibernation: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files

I tried looking for *.service files in my system, but I don't have the one that Transmission is looking for.

I got Linux Mint 13 Maya 64bit Mate edition installed.
How can I solve this problem?

Thanks in advance.

[pasqoo]

No possibility to solve this?