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

Also check these dependencies package.json:

...
"@angular/cli": "x.x.x",
"@angular/compiler": "^y.y.y",
"@angular/compiler-cli": "^z.z.z",
"typescript": "^t.t.t"
...

Hope this helps...