Core-js Error

Hi guys,

I need some help regarding one of my project i am working on. I am getting the error below.
Some of the things that i have already tried resolving this issue are as follow:

  1. Deleted node_modules, npm install
  2. Deleted the build folder, and recreated them ionic serve
  3. Created a new project and copied my src folder files too.
  4. Installed core-js@3.0.1 && core-js@2.6.5 via npm too

But i am unable to resolve this. Can someone please help. This is driving me crazy. Spent almost 2 days on it.