Cyberpanel installation failed on Ubuntu

While installing Cyberpanel the following error is showing:

–2020-12-12 05:37:02-- https://rep.cyberpanel.net/ubuntu-pip-2.zip
Resolving rep.cyberpanel.net (rep.cyberpanel.net)… 18.133.147.179
Connecting to rep.cyberpanel.net (rep.cyberpanel.net)|18.133.147.179|:443… connected.
ERROR: cannot verify rep.cyberpanel.net’s certificate, issued by ‘CN=Let’s Encrypt Authori
ty X3,O=Let’s Encrypt,C=US’:
Issued certificate has expired.
To connect to rep.cyberpanel.net insecurely, use `–no-check-certificate’.

command failed, exiting…

Cyberpanel was not installed successfully on my server.