Problem at VaadinUIComponent ui1 = new VaadinUIComponent("/app"); Error:

Directory Embedded UI
1

Problem at

VaadinUIComponent ui1 = new VaadinUIComponent(“/app”);

Error:
Uncaught SyntaxError: Unexpected token < in JSON at position 0
at JSON.parse ()
at XMLHttpRequest.r.onreadystatechange (vaadinBootstrap.js?v=7.7.7:168)