deepak saralaya

Currently getting below issue. TypeError: Observable_1.Observable.of is not a function at Droppable.push../node_modules/ng-drag-drop/src/directives/droppable.directive.js.Droppable.allowDrop (droppable.directive.js:151) at SafeSubscriber._next (droppable.directive.js:161)

am getting below issue on tns preview in ios Terminating app due to uncaught exception 'NativeScript encountered a fatal error: ReferenceError: Can't find variable: QRCodeReaderDelegate at 1 @file:///app/vendor.js:479:67 2 ../node_modules/nativescript-barcodescanner/barcodescanner.js@file:///app/vendor.js:481:2...