Ember app error - Could not find module `undefined/app` imported from `(require)`

I'm able to start my ember app but nothing loads in the screen and I noticed this error in browser console log. Any idea about what could I be missing?

ember serve

WARNING: Node v16.14.2 is not tested against Ember CLI on your platform. We recommend that you use the most-recent "Active LTS" version of Node.js. See https://git.io/v7S5n for details.

Running without permission to symlink will degrade build performance.
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File added: "package.json"

Server restarted.

file changed index.js.map

Build successful (8338ms) – Serving on http://localhost:4200/

Slowest Nodes (totalTime >= 5%)                                                                             | Total (avg)
------------------------------------------------------------------------------------------------------------+---------------------------
Babel: @ember/test-helpers (1)                                                                              | 2631ms
Bundler (1)                                                                                                 | 1011ms
BroccoliRollup (6)                                                                                          | 1008ms (168 ms)
ember-auto-import-analyzer (3)                                                                              | 626ms (208 ms)
Package /assets/vendor.js (1)                                                                               | 569ms


Build successful (566ms) – Serving on http://localhost:4200/

Slowest Nodes (totalTime >= 5%)                                                                             | Total (avg)
------------------------------------------------------------------------------------------------------------+---------------------------
Package /assets/vendor.js (1)                                                                               | 79ms
Concat: Vendor Styles/assets/vendor.css (1)                                                                 | 72ms
Funnel (54)                                                                                                 | 42ms (0 ms)

and this is the console error

loader.js:247 
        
       Uncaught Error: Could not find module `undefined/app` imported from `(require)`
    at missingModule (loader.js:247:1)
    at findModule (loader.js:258:1)
    at requireModule (loader.js:24:1)
    at app-boot.js:3:1