Error: NG0204 with no specific details after Angular upgrade from 8 to 14

I have been working on this task to upgrade from angular 8 to 14. After upgrading to 14 I am seeing this Error: NG0204 error in the console on serving my app. No additional information is provided (see image attached)



Seems like the error happens in index.html when we reach the <app-root> selector. Hence, the app component constructor doesn't load either.

Any idea what this could be related to?

I have tried debugging but couldn't understand whats going on here since theres no additional details in the error.

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