I got this problem without changing my code. Old tagged versions of my project stopped working as well.
"@angular/compiler-cli": "^2.4.2",
"angular-cli": "1.0.0-beta.20-4",
I tried to update typescript to 2.2 but it doesn't change anything. It is a larger project so I don't want to update angular at the moment.
I'm sorry, but this issue is not caused by Angular CLI. Please contact the author(s) of the https://github.com/angular/angular project or file an issue on their issue tracker.
Actually, sorry, I misread the issue. Reopening to investigate.
I'm not sure what happened to your dependencies, but most likely reinstalling dependencies got you different versions of @ngtools/webpack. You can try pinning it in your package.json to a version that works for your project, but we don't really support 1.0.0-beta.20-4 anymore.
Finally found the solution see the below screenshots and steps to resolve this issue
http://itechiesol.blogspot.com/2017/07/angular-compiler-cli-package-was-not.html
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Most helpful comment
Finally found the solution see the below screenshots and steps to resolve this issue
http://itechiesol.blogspot.com/2017/07/angular-compiler-cli-package-was-not.html