This is what I got after entering the command.

BusyBox v1.10.2 (Debian 3:1.10.2.legal-1osso30+0m5) built-in shell (ash)
Enter 'help' for a list of built-in commands.

~ $ sudo rm -r /home/user/.yappari
rm: cannot remove '/home/user/.yappari': No such file or directory
~ $

I'm on the verge of installing CSSU. Thanks