Copy app error

1) Create file /etc/sysctl.d/60-copy.conf

2) Open that file and write:

fs.inotify.max_user_watches = 20000
fs.file-max = 800000
3) Save the file and exit

4) Go to the terminal and apply those settings by typing:

sudo sysctl -p /etc/sysctl.d/60-copy.conf
5) Launch the Copy app again and it should work.