UNSOLVED Browsers do not show Views.

[g327igor]

Browsers do not show Views. In browsers's developer tools I have next error:
Create inner vis object mqtt.0.Control.Kitchen.window
vis.js:3167 Create inner vis object mqtt.0.LivingRoom.lamp
vis.js:3167 Create inner vis object 120.1614
vis.js:3167 Create inner vis object 30.2936
vis.js:658 Uncaught TypeError: Cannot read property 'alwaysRender' of undefined
at Object.initNext (vis.js:658)
at Object.<anonymous> (vis.js:554)
at Object.loadWidgetSets (vis.js:521)
at Object.init (vis.js:553)
at vis.js:3228
at n.<anonymous> (conn.js:1236)
at n.onack (universalModuleDefinition:3)
at n.onpacket (universalModuleDefinition:3)
at n.<anonymous> (universalModuleDefinition:3)
at n.emit (universalModuleDefinition:2)

[g327igor]

I resolved this problem. By importing Widget was created not new widget but new View with error. Just removed View with error which did not allow rendering of Web pages.