maven install error - only whitespace content allowed before start tag and not \u0

The problem is in file ecommerce-web/maven-metadata-local.xml, it contains char(0) (or null char, or Unicode: 0x0).
Clean all local repository, or delete folder with com.app:ecommerce-web artifact

There is nothing in my maven-metadata-local.xml

It's not true. Open your file with Notepad++ and you will see many nulls

Just go under

C:\Users\admin\.m2\repository\com\app\ecommerce-web\

and delete maven-metadata-local.xml Then do a clean install one more time, this should fix the problem and that's what I did.