Error: Schema validation failed with the following errors: Data path “” should NOT have additional properties(project)

Question

After migrating application from angular 5 to 6, on running ng serve the following errors pop up.

Schema validation failed with the following errors:

Answer 1

Updating npm and angular fixed mine:

Assuming you use npm

npm update

then run:

ng update

NB: You might be prompted to update individual dependencies. In my case, I was prompted to run:

ng update @angular/cli and ng update @angular/core.