Please help with this error

Hope this helps:


if it doesn’t, please provide your package.json details

{
“name”: “ASNMessenger”,
“version”: “1.0.0”,
“author”: “ASN”,
“homepage”: “asn.com.ru”,
“description”: “ASNMessenger”,
“scripts”: {
“ng”: “ng”,
“start”: “ng serve”,
“build”: “ng build”,
“test”: “ng test”,
“lint”: “ng lint”,
“e2e”: “ng e2e”
},
“private”: true,
“dependencies”: {
@angular/common”: “^7.2.2”,
@angular/core”: “^7.2.2”,
@angular/forms”: “^7.2.2”,
@angular/http”: “^7.2.2”,
@angular/platform-browser”: “^7.2.2”,
@angular/platform-browser-dynamic”: “^7.2.2”,
@angular/router”: “^7.2.2”,
@ionic-native/camera”: “^5.0.0”,
@ionic-native/core”: “^5.0.0”,
@ionic-native/network”: “^5.0.0”,
@ionic-native/onesignal”: “^5.0.0”,
@ionic-native/photo-viewer”: “^5.0.0”,
@ionic-native/splash-screen”: “^5.0.0”,
@ionic-native/status-bar”: “^5.0.0”,
@ionic/angular”: “^4.0.0”,
@ionic/schematics-angular”: “^1.0.7”,
“com-sarriaroman-photoviewer”: “^1.2.0”,
“cordova-android”: “7.1.1”,
“cordova-ios”: “4.5.5”,
“cordova-plugin-camera”: “^4.0.3”,
“cordova-plugin-device”: “^2.0.2”,
“cordova-plugin-ionic-keyboard”: “^2.1.3”,
“cordova-plugin-ionic-webview”: “^3.1.2”,
“cordova-plugin-network-information”: “^2.0.1”,
“cordova-plugin-splashscreen”: “^5.0.2”,
“cordova-plugin-statusbar”: “^2.4.2”,
“cordova-plugin-whitelist”: “^1.3.3”,
“core-js”: “^2.5.4”,
“onesignal-cordova-plugin”: “^2.4.7”,
“rxjs”: “~6.3.3”,
“zone.js”: “~0.8.29”
},
“devDependencies”: {
@angular-devkit/architect”: “~0.12.3”,
@angular-devkit/build-angular”: “~0.12.3”,
@angular-devkit/core”: “~7.2.3”,
@angular-devkit/schematics”: “~7.2.3”,
@angular/cli”: “~7.2.3”,
@angular/compiler”: “~7.2.2”,
@angular/compiler-cli”: “~7.2.2”,
@angular/language-service”: “~7.2.2”,
@ionic/angular-toolkit”: “^1.4.1”,
@types/jasmine”: “~2.8.8”,
@types/jasminewd2”: “~2.0.3”,
@types/node”: “~10.12.0”,
“codelyzer”: “~4.5.0”,
“jasmine-core”: “~2.99.1”,
“jasmine-spec-reporter”: “~4.2.1”,
“karma”: “^4.0.0”,
“karma-chrome-launcher”: “~2.2.0”,
“karma-coverage-istanbul-reporter”: “~2.0.1”,
“karma-jasmine”: “~1.1.2”,
“karma-jasmine-html-reporter”: “^0.2.2”,
“protractor”: “~5.4.0”,
“ts-node”: “~8.0.0”,
“tslint”: “~5.12.0”,
“typescript”: “~3.1.6”
},
“cordova”: {
“plugins”: {
“cordova-plugin-camera”: {},
“onesignal-cordova-plugin”: {},
“cordova-plugin-whitelist”: {},
“cordova-plugin-device”: {},
“cordova-plugin-splashscreen”: {},
“cordova-plugin-ionic-webview”: {
“ANDROID_SUPPORT_ANNOTATIONS_VERSION”: “27.+”
},
“cordova-plugin-ionic-keyboard”: {},
“com-sarriaroman-photoviewer”: {},
“cordova-plugin-statusbar”: {},
“cordova-plugin-network-information”: {}
},
“platforms”: [
“android”,
“ios”
]
}
}

When you use @ionic/angular-toolkit as a dependency, you also need to update angular.json by replacing all occurrences of @ionic/ng-toolkit and @ionic/schematics-angular by @ionic/angular-toolkit