Impersonation failure

I am using AEM6.4 and logged in using admin acess. While using AEM Security I created a user and from dropdown given in the top-right corner I tried impersonating it as the newly created user. After that I cannnot access anything from my project.

Opening the localhost:4502 gives "A custom errorhandler for 404 responses".

This is screenshot of my CRXDE Lite