title: Angular 9 - @angular/core/core"' has no exported member 'ɵɵFactoryDef'
body: <p>I keep getting this error when trying to run ionic serve command in terminal. </p>
  
  <p>I have looked this up and seen I need to delete the npm_modules file and reinstall </p>
  
  <p>What is the command for this? or how do i do it? </p>