Sounds like this is occuring at the project create step?
Are you able to create a blank project?
Is it jsut the clone step that is failing?
This usually trips as NodeJS and/or NPM is not installed on your System and is not in $path
You may wish to skip the Hello World example and refer to the code for it via github, if you don’t intend to program your extension EBS in node (that is if your extension needs an EBS)