ECLIPSE - Cannot change version of project facet Dynamic Web Module to 3.1

>PROBLEM

Attempt to switch Web Module version in "Project Facets" is denied, not allowed, returning a message like this:

Cannot change version of project facet Dynamic Web Module to 3.1. sisgit2 line 1 Maven Java EE Configuration Problem

>SOLUTION

Go to the eclipse's project root directory at:

$ECLIPSE_PROJECT_ROOT\.settings\org.eclipse.wst.common.project.facet.core.xml


Change here:

From:
<installed facet="wst.jsdt.web" version="1.0"></installed>
To:
<installed facet="jst.web" version="3.1"></installed>

>ENV

Windows 10
Eclipse 2019


@FROM:
stackoverflow.com/questions/18122336/cannot-change-version-of-project-facet-dynamic-web-module-to-3-0