Error connecting with wifi module

I am making a project that connect to internet.
I connect my wifi network with arduino uno and esp8266.
But I cannot connect wifi.
When I check with WiFi.scanNetworks(), it returns 0.
And WiFi.status() return 255.
What is the the cause of the problem?
Please help me.
Find the attached files.

Final03Proj.ino (1.9 KB)