Neo4j Causal Clustering Exercise #1 neo4j-docker script files not executing on mac/unix

[kangwachimba7]

I am doing the neo4j Admin online training I am stuck on Exercise 1 of Causal Clustering. I have docker installed and neo4j-docker installed when i try to run the command "sudo ./create_initial_cores.sh " I am getting the following errors in my terminal:

"
Error response from daemon: network with name training-cluster already exists
docker: invalid reference format: repository name must be lowercase.
See 'docker run --help'.
docker: invalid reference format: repository name must be lowercase.
See 'docker run --help'.
docker: invalid reference format: repository name must be lowercase.
See 'docker run --help'.
Error response from daemon: No such container: core1
Error response from daemon: No such container: core2
Error response from daemon: No such container: core3
"

[kangwachimba7]

Found the reason its because I extracted the file (Neo4j-docker) in the Neo4j-enterprise bin folder. When I extract the file outside the Neo4j-enterprise folder it works just fine