while launching perspective view showing this error. pls help me to sort it out
Not something I have seen - can you post the full error message (stack)?
Ok, so it’s failing when trying to launch a session, not in the designer itself.
I have not seen that issue. In asking some of our devs that use Windows, they suggested checking to see if you have a default browser set in the operating system.
I assume that visiting the url directly by entering it into your browser is working correctly?