I get this error when trying to build nethunter, what should i do?

Code:
root@kali:~/kali-nethunter/nethunter-installer# python build.py -d manta --lollipop 
Downloading: Hackerskeyboard.apk (1243775 bytes)
    1243775  [100.00%]
Download OK: update/data/app/Hackerskeyboard.apk
Downloading: Drivedroid.apk (4545682 bytes)
    4545682  [100.00%]
Download OK: update/data/app/Drivedroid.apk
Downloading: RouterKeygen.apk (4553315 bytes)
    4553315  [100.00%]
Download OK: update/data/app/RouterKeygen.apk
Downloading: USBKeyboard.apk (7027446 bytes)
    7027446  [100.00%]
Download OK: update/data/app/USBKeyboard.apk
Downloading: OpenVPN.apk (8186917 bytes)
    8186917  [100.00%]
Download OK: update/data/app/OpenVPN.apk
Downloading: cSploit.apk (3751923 bytes)
    3751923  [100.00%]
Download OK: update/data/app/cSploit.apk
Downloading: Shodan.apk (7945260 bytes)
    7945260  [100.00%]
Download OK: update/data/app/Shodan.apk
Downloading: RFAnalyzer.apk (1567092 bytes)
    1567092  [100.00%]
Download OK: update/data/app/RFAnalyzer.apk
Finished downloading all apps
URLError = [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:590)
Error: Could not retrieve download URL for SuperSU