Cant add wireless printer

When i try to add wirelessly connected printer via HPLIP setup(Option: Network/Ethernet/Wireless network), i get always this error:

HPLIP cannot detect printers in your network.
This may be due to existing firewall settings blocking the required ports. When you are in a trusted network environment, you may open the ports for network services like mdns and slp in the firewall. For detailed steps follow the link. http://hplipopensource.com/node/374

I dont know hoe to fix this. My firewall is fully disabled. My distro is Manjaro Linux with XFCE.