here is the full screenshot of the terminal.
When I give "butler" command, it start giving error.
You are trying to run butler from the wrong directory.
By default, the command line is starting in your user's root folder, but from the image, the Butler executable is inside "Desktop".
I don't know MAC, but in linux you would have 2 options.
move to the "Desktop" directory with
cd /Users/XXXXX/Desktop
And then you could execute
butler login
Another option is that you indicate the absolute path, just as you do when you call butler's help, that is, with
/users/XXXX/Desktop/butler login