Install gir1.2-xapp-1.0 by entering the following commands in the terminal:
sudo apt update sudo apt install gir1.2-xapp-1.0
Description:
Introspection data for XApp
This package contains the introspection data for XApp.
Homepage: http://cinnamon.linuxmint.com/
Version: 1.0.4-2fakesync1
Section: universe/introspection