This version of CLI is only compatible with Angular versions 0.0.0 || ^9.0.0-beta || >=9.0.0 <10.0.0, but Angular version 11.2.7 was found instead. code example

Example 1: This version of CLI is only compatible with Angular versions ^9.0.0-beta || >=9.0.0 <10.0.0, but Angular version 8.1.3 was found instead.

ng update @angular/cli @angular/core --allow-dirty --force

Example 2: This version of CLI is only compatible with Angular versions 0.0.0 || ^10.0.0-beta || >=10.0.0 <11.0.0, but Angular version 9.1.3 was found instead.

npm install --save -dev @angular/cli@latest