Multiple authentication system error on linux system

Hi Genius,
I am new to Linux world, learning it. To my knowledge I have one authentication agent in my system, but the error message says it already exists. How can I find out there is more than one authentication agent? Is it a bug? If it is how it will be fixed? Help me to fix the issue. Your help is appreciated.
Error Image

Words in the Error Image
Error
GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: An authentication agent already exists for the given subject
