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``` An uncaught Exception occurred on "main" thread. com.tns.NativeScriptException: Calling js method run failed TypeError: Cannot read property 'getRootView' of undefined File: file:///data/data/org.nativescript.preview/files/app/tns_modules/tns-core-modules/ui/frame/frame.js, line: 56, column:29 ```
Use the frame in the following way:
To navigate to the starting page of the application
// put this in the bootstrap.js
var app = require("application");
var frameModule = require("ui/frame");
app.onLaunch = function(context) {
var frame = new frameModule.Frame();
frame.navigate("testPage");
}
// or use the mainModule property of the application module
// in this a Frame instance is internally created and used to navigate to the main page module
app.mainModule = "testPage";
To navigate to a new Page
// take the frame from an existing (and navigatedTo) Page instance
var frame = page.frame;
frame.navigate("newPage");
To navigate to a new Activity (Android)
// create a new Frame instance
var frameModule = require("ui/frame");
var frame = new frameModule.Frame();
frame.navigate("newPage");