Error install loraserver from docker

hi all.
I’m newbie Lorawan. I have a Lora gateway RAK831+RPi3.I’m followed the link to install loraserver on Virtualbox but when I go to localhost:8080 on the browser, It encountered problems like this image

and here is video show my error
Can anyone help me?

try https://localhost:8080

remote error: tls: unknow certificate authority

thanks, it worked. i go https:localhost:8080 and clink addvanced