Codepipeline not working wiht Github

Not sure of this is related to VAADIN,
I followed your tutorial on how to deploy directly, from Netbeans to Github to Codepipeline to AWS Elastic beanstalk,
if I deploy the WAR file myslef, everything works fine, if I use the previous way, it produces this

HTTP Status 404 – Not Found
Type Status Report

Message The requested resource
[/] is not available

Description The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.

Apache Tomcat/8.5.60