Can't connect to my wireless network though GNOME

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http://unix.stackexchange.com – I am a complete Linux beginner and I managed to install Archlinux today. But I have no access to my wifi for some reason. I get internet access in my terminal with wifi-menu but gnome tells me that it can not connect to my wireless network. The password is 100% correct. I followed this guide and installed network-manager-applet, and I also changed the rc.conf file: rc.d start networkmanager I also installed pacman -S networkmanager I restarted networkmanager, enabled / disabled it, started it again. I also turned the wireless network in GNOME on and off. But nothing helped. Any ideas w (HowTos)