I have updated my angular version to 7.2.4, I still have this error.
here are my package.json dependencies
"dependencies": {
"@angular/common": "~7.2.4",
"@angular/core": "~7.2.4",
"@angular/forms": "~7.2.4",
"@angular/http": "~7.2.4",
"@angular/platform-browser": "~7.2.4",
"@angular/platform-browser-dynamic": "~7.2.4",
"@angular/router": "~7.2.4",
"@auth0/angular-jwt": "^2.1.0",
"@fortawesome/fontawesome-free": "^5.7.1",
"@ionic-native/core": "5.0.0",
"@ionic-native/native-storage": "^5.0.0",
"@ionic-native/splash-screen": "5.0.0",
"@ionic-native/sqlite": "^5.0.0",
"@ionic-native/status-bar": "5.0.0",
"@ionic/angular": "4.0.1",
"@ionic/pro": "2.0.4",
"@ionic/storage": "^2.2.0",
"cordova-android": "7.1.4",
"cordova-ios": "5.0.0",
"cordova-plugin-device": "^2.0.2",
"cordova-plugin-file": "6.0.1",
"cordova-plugin-file-transfer": "1.7.1",
"cordova-plugin-ionic": "5.3.0",
"cordova-plugin-ionic-keyboard": "^2.1.3",
"cordova-plugin-ionic-webview": "^3.1.2",
"cordova-plugin-splashscreen": "^5.0.2",
"cordova-plugin-statusbar": "^2.4.2",
"cordova-plugin-whitelist": "^1.3.3",
"cordova-sqlite-storage": "3.0.0",
"core-js": "^2.6.4",
"es6-promise-plugin": "^4.2.2",
"lodash": "^4.17.11",
"rxjs": "~6.4.0",
"sqlite": "3.0.1",
"webpack-dev-server": "^3.1.14",
"zone.js": "^0.8.29"
},
"devDependencies": {
"@angular-devkit/architect": "~0.13.1",
"@angular-devkit/build-angular": "^0.13.1",
"@angular-devkit/core": "~7.3.1",
"@angular-devkit/schematics": "~7.3.1",
"@angular/cli": "~7.3.1",
"@angular/compiler": "^7.2.4",
"@angular/compiler-cli": "^7.2.4",
"@angular/language-service": "~7.2.4",
"@ionic/angular-toolkit": "^1.3.0",
"@ionic/app-scripts": "^3.2.2",
"@types/jasmine": "^3.3.8",
"@types/jasminewd2": "~2.0.3",
"@types/node": "^10.12.24",
"codelyzer": "~4.5.0",
"jasmine-core": "~3.3.0",
"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": "~2.0.1",
"karma-jasmine-html-reporter": "^1.4.0",
"protractor": "~5.4.0",
"ts-node": "~8.0.2",
"tslint": "~5.12.0",
"typescript": "^3.2.4"
},