You can clone with
HTTPS or Subversion.
A few users have now run across this issue where a string value for the repository property results in the jitsu service failing to deploy and reports Nodejitsu Error (500): Internal Server Error.
Nodejitsu Error (500): Internal Server Error
On creating the app the api service returns 500 because it tried to validate the repository field to an object.
Running npm init will create the "repository": "" line in a users package.json file which will cause this.
This was fixed on the master API side.