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

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node.js: flash: a req.session is required!

>PROBLEM

a req.session is required!
AssertionError [ERR_ASSERTION]: a req.session is required!
    at L:\work\devcli_\javascript\node\projects\tellme4\tellme4\node_modules\flash\index.js:6:5
    at Layer.handle [as handle_request] (L:\work\devcli_\javascript\node\projects\tellme4\tellme4\node_modules\express\lib\router\layer.js:95:5)
    at trim_prefix (L:\work\devcli_\javascript\node\projects\tellme4\tellme4\node_modules\express\lib\router\index.js:317:13)
    at L:\work\devcli_\javascript\node\projects\tellme4\tellme4\node_modules\express\lib\router\index.js:284:7
    at Function.process_params (L:\work\devcli_\javascript\node\projects\tellme4\tellme4\node_modules\express\lib\router\index.js:335:12)
    at next (L:\work\devcli_\javascript\node\projects\tellme4\tellme4\node_modules\express\lib\router\index.js:275:10)
    at logger (L:\work\devcli_\javascript\node\projects\tellme4\tellme4\node_modules\morgan\index.js:144:5)
    at Layer.handle [as handle_request] (L:\work\devcli_\javascript\node\projects\tellme4\tellme4\node_modules\express\lib\router\layer.js:95:5)
    at trim_prefix (L:\work\devcli_\javascript\node\projects\tellme4\tellme4\node_modules\express\lib\router\index.js:317:13)
    at L:\work\devcli_\javascript\node\projects\tellme4\tellme4\node_modules\express\lib\router\index.js:284:7


>SOLUTION

>>WRONG:

//*** wrong place of flash configuration, before session:
app.use(flash());
app.use(passport.initialize());
app.use(passport.session());
app.use(session({
  secret: "fd34s@!@dfa453f3DF#$D&W",
  resave: false,
  saveUninitialized: true,
  cookie: { secure: !true }
}));


>>RIGHT:

app.use(passport.initialize());
app.use(passport.session());
app.use(session({
  secret: "fd34s@!@dfa453f3DF#$D&W",
  resave: false,
  saveUninitialized: true,
  cookie: { secure: !true }
}));
//*** right place after session:
app.use(flash());


>ENV
w10
node.js