Okay, and did you unzip all of the contents of the Swarm zip file to a folder? Can you attach a screenshot of the folder?
swarm.sh file looks for a folder called
lib on the same directory level that you run the command from, so if by chance you just unzipped the script and not the rest of the contents, you will run into this error.
Along those same lines, the other error you could be having is: you need to
cd into the swarm folder prior to running the
swarm.sh script. That might look like this:
# change directory into your swarm folder:
# now run the script: