I am running through the LinkedIn learning “intro to linux” course and I’m on the tar video/practice. for some reason .tar.bz2 creates an empty archive and hen I get an error when I try to unpack it

It has me run in my Ubuntu VM:

    tar -caf myfiles.tar /Exercise Files/
    tar -caf myfiles.tar.bz2 /Exercise Files/
    tar -caf myfiles.tar.gz /Exercise Files/
    mv myfiles.tar.bz2 /unpack1
    cd /unpack1
    tar -xf myfiles.tar.bz2

After creating the three archives, the video has me ' ls -l' to show they were created and that something is actually in them. The first issue is that the .tar.bz2 archive shows as empty.
The second is when I try the tar -xf myfiles.tar.bz2 I get an error “tar: this doesn’t look like a tar archive. tar (child): Bzip2 cannot exec: no such file or directory.”

I made sure that my ubuntu is updated and I’ve followed is commands to a tee.

Is there something I’m missing or need to install? I also noticed the archive sizes were slightly different (his showed like 117k and mine showed 170k)

any assistance is greatly appreciated! TIA!!!!!!