Thanks for answering.
The errors I am getting at the moment, come from scripts in my angular.json file
While updating to Angular 9, I updated my packages and the newer foundation-sites package does not have a ‘vendor’ folder. The version of foundation I was using was 6.2.4 and with the automatic updates it was changed to 6.6.1
Here is the error:
An unhandled exception occurred: Script file node_modules/foundation-sites/vendor/modernizr/modernizr.js does not exist.
See “/tmp/ng-pRmExd/angular-errors.log” for further details.
My guess is I need to update foundations more gradually, instead of skipping so many releases at once?