Try to delete that "angular/cli": "1.0.0-beta.28.3", in the devDependencies it is useless , and add instead of it "@angular/compiler-cli": "^2.3.1", (since it is the current version, else add it by npm i --save-dev @angular/compiler-cli ), then in your root app folder run those commands:
rm -r node_modules(or delete yournode_modulesfolder manually)npm cache clean(npm > v5 add--forceso:npm cache clean --force)npm install