Adding neo4j as a service to your circle.yml will result in an authorization error, despite indication in the docs that a password is not required. You can disable neo4j authorization and work around this by adding the following to your circle.yml:
machine:
pre:
- sudo sed -i "s|dbms.security.auth_enabled=true|dbms.security.auth_enabled=false|g" /etc/neo4j/neo4j-server.properties
We are aware of this issue and are working to deploy a fix in a future container release.