Map Label network show unknown

[lcw321321]

My case:
zabbix 5.0
Ubuntu 18.04.5 LTS

Map's Label:

Host:{HOST.NAME}
IP:{HOST.IP}
OS:{{HOST.HOST}:system.uname.last(0)}
CPU Load:{{HOST.HOST}:system.cpu.load[all,avg5].last(0)}
Free memory:{{HOST.HOST}:vm.memory.size[pavailable].last(0)}...