ERROR: connect ECONNREFUSED 0.0.0.0:4444

ECONNREFUSED stands for connection refused by the server. 

One of the scenario this error occurs when you try to use the standalone selenium server and java is not installed in your machine. 

• Please install https://www.java.com/en/download/
• Make sure its added to your system path.  

Hopefully, it resolves your issue.