Exec OpenHab2

Hi!
I have installed OpenHab2 on RaspberryPi3.

My python3 script return wheather from my meteo station:

pi@rpi:/etc/openhab2/sitemaps $ python3 /home/pi/meteo.py
12

(temperaute in Celsius)

I created things (wheather.things)

Thing exec:command:wheather [command="python3 /home/pi/meteo.py", interval=30,  timeout=5]

Items (wheather.items):

String wheather "Температура на улице [%s]" (All) {channel="exec:command:wheather:output"}

Sitemaps(wheather.sitemap):

sitemap whether label="Улица"
{
Frame label="Температура" {
Text item=wheather icon="temperature"
}

But it’s not work =( I open Basic UI and saw:

Температура на улице   -