Versions of @angular/compiler-cli and typescript could not be determined

Question

I have installed Angular/cli and then try to run command ng serve then below error is throwing. I have tried lot of thing like uninstall angular/cli, npm cache clean, etc

Answer 1

First, for prevent, update angular

npm install -g @angular/cli

Second, also the run "npm install", you must install dev dependencies

npm install --dev

verify dependencies are without error

ng --version