getting error while using other Schematics in this project

[sandgupta23]

I ran following in this project and got error:

ng add @angular/material

Two or more projects are using identical roots. Unable to determine project using current working directory. Using default workspace project instead.
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.
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Schematic input does not validate against the Schema: {"project":null,"theme":"pink-bluegrey","gestures":false,"animations":false}
Errors:

  Data path ".project" should be string.

[JanMesaric]

Same issue is happening to me.

EDIT: there must be a problem in angular.json file, I was able to successfully run command after replacing the content of it with a content of angular.json from a freshly created project, installed, reverted back to original.

[dainbrump]

Ran into this issue myself. In my case it was because I first ran ng new my-project --create-application=false. I was just trying to build a quick project for experimentation. Taking out the create-application and simply going with --minimal gave me a lightweight initial app and cleared up the error.

[develvad]

add "defaultProject": "ng-universal-demo" to angular.json for solve it.