For this tutorial you will have already followed the instructions to set up your development environment. There are some scripts to start the Fabric:
downloadFabric.sh
startFabric.sh
createPeerAdminCard.sh
If you run that last script it should solve your problem.
You can run composer card list
to verify that you have the PeerAdmin card.
After further testing ...
I would say that either there is an existing card that can't be deleted for some reason, or else you do not have access to create the folder ~/.composer
.
I would suggest using this command to check if the folder exists ls ~/.composer
and if it does, then rm -rf ~/.composer
to remove it and all its contents. Now create a new empty folder mkdir ~/.composer
and rerun the script to create the Peer Admin card createPeerAdminCard.sh
from the fabric-tools folder.