Invalid rule result: Instance of class Promise

Question

I work with Angular 7.1.4. I want to generate a new module with the following line;

ng g m order-process

But I encountered an error:

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Answer 1

make sure that your angular cli version and @schematics/angular should be same then only ng add @angular/pwa < project name same as in angular.json file >

will execute and run successfully and the service worker module will be added to the project