The following error has occured:
'' is not a valid login or you do not have permission.
This error occurs when system name and login names are same. My laptop and login names are same.

This error occurs after adding my login accounts in "Specify SQL Server administrators" on "Database Engine Configuration" tab.

How to get rid this error?
We can achieve this goal using 2 methods.
1. Login in two another windows login account and install.
2. Do not add your account and add another account which name is differ from system. I have used VM.
I have tried both methods and succeeded.