"Wireless Interface(wlan0) The WiFi network could not be found"

I use Slackware Linux 15.0 with KDE Plasma. When I try to connect to wireless network it gives me error.
Link to screenshot: https://imgur.com/a/Q93FPie.

Information about wlan0 device(nmcli command):

wlan0: disconnected
"TP-Link TL-WN822N Version 4 RTL8192EU"
2 connections available
wifi (rtl8xxxu), FA:76:DE:3D:56:4D, autoconnect, hw, mtu 1500