Step 1: angular.json add styles for "styles": "./node_modules/ngx-toastr/toastr.css", step 2: package.json "@ngrx/store": "^12.5.1", "lodash": "^4.17.21", "ngx-toastr": "^14.2.1", step 3: run following command npm i step 4: appsettings.json change to false "UseInMemoryDatabase": false,