NetworkManager not working normally?

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https://bbs.archlinux.org – Hello!I used to set up two connections by the NetworkManager:Local and ADSL.The first is a static ip config in my college and the other one is a pppoe service.But since I changed to systemd, I found that I cannot switch between them. I have seen the wiki ,but it doesn't work.PS: Local is used as the default connection.Then I check the logs, in user.log it says:Sep 17 12:26:24 archlinux NetworkManager[272]: <error> [1347855984.216283] [nm-manager-auth.c:87] pk_authority_get(): Failed to initialize PolicyKit: (1) Error initializing authority: Could not connect: No such file or directo (HowTos)