Ember application runtime error uncaught referenceerror ember is not defined vendor.js

I'm trying to upgrade the ember from 3.* to 4.12.2. I'm not getting any compilation issues but when I run my application I'm getting "uncaught referenceerror ember is not defined" inside the vendor.js file.

Any help appreciated, Thank you in advance.

Regards

I tried removing deprecated libraries, tried using auto import still getting this same issue