When angular4.0 starts the project, an error is reported: the “@ angular / compiler cli” package was not properly installed

After creating the project through NG New My-app,
When ng serve –open, the following error is reported
The “@angular/compiler-cli” package was not installed
The solution is as follows
1. Enter mY-APP directory and delete node_modules
2, through the command NPM install, re-download

Front-end AC group: 468103283

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