ERROR WHILE ATTEMPTING TO INSTALL WEB-GREETER-MASTER IN LINUXMINT

[sb-online]

OS: linuxmint-20.3-cinnamon-64bit
INSTALLING DEPENDENCIES
sudo apt install liblightdm-gobject-1-dev python3-gi python3-pyqt5 python3-pyqt5.qtwebengine python3-ruamel.yaml python3-pyinotify libqt5webengine5 gobject-introspection libxcb1-dev libx11-dev
curl -fsSL https://deb.nodesource.com/setup_16.x | sudo -E bash - &&
sudo apt-get install -y nodejs
sudo npm i -g typescript
sudo apt-get install pyqt5-dev-tools
npm install nody-greeter-types

Go to https://github.com/JezerM/web-greeter
Click on Code > Down arrow > Download zip
cd Downloads
web-greeter-master.zip
extract
cd Downloads/web-greeter-master
sudo make install

output
Bash completion to install at: /usr/share/bash-completion/completions
No ZSH completion
✔ Dist files copied
✔ Config copied
 Gruvbox theme copied
 Dracula theme copied
✔ Resources compiled with pyrcc5
✔ Screensaver.so compiled
✔ web-greeter binary copied
✔ Build succeded
[ -e "/" ] || mkdir -p "/"
cp -R "/home/live/Downloads/web-greeter/build/install_root"/* "/"
✔ Install succeded
sudo pico /etc/lightdm/lightdm.conf.d/70-linuxmint.conf

[SeatDefaults]
user-session=cinnamon
greeter-session=web-greeter
#greeter-session=slick-greeter
greeter-hide-users=false
save

web-greeter --debug
Output
An error occured. Do you want to change default theme?
userscript:Web Greeter Bundle 739 ..................

Use Default theme
.............
web-greeter://app/share/web-greeter/themes/gruvbox/js/index.js 0. Failed to load module script. The server responded with a non-JavaScript MIME type of ""......