goBack() failed

hi. first everytime i need start fuse, i need to reinstall. why?
second, my local preview keeps disconnect.
third, (this happened before my local preview disconnect) my goBack() with router failed i’ve tried with but still failed.
my fuse version is 0.35.0 (build 10867)
windows 10

this is my code.

MainView.ux

<App>
	<Router ux:Name="router" />
	<ClientPanel>
		<Navigator DefaultTemplate="test">
			<Test ux:Template="test" router="router" />
			<TestTwo ux:Template="testtwo" router="router" />
		</Navigator>
	</ClientPanel>
</App>

Test.ux

<Page ux:Class="Test">
	<Router ux:Dependency="router" />
	<JavaScript File="Test.js" />
	<Panel>
		<Button Text="GO TO TEST 2" Clicked="{goToTestTwo}" />
	</Panel>
</Page>

Test2.ux

<Page ux:Class="TestTwo">
	<Router ux:Dependency="router" />
	<JavaScript File="Test.js" />
	<Panel>
		<Button Text="CANCEL" Clicked="{goBack}" />
	</Panel>
</Page>

Test.js

function goBack() {
    router.goBack();
}

function goToTestTwo(){
	router.goto("testtwo");
}
module.exports = {
	goBack: goBack,
	goToTestTwo: goToTestTwo
};

if you didn’t solved problem yet, try this.

function goToTestTwo(){
router.push(“testtwo”);
}