E17 error

Hi,
I am new to programming and currently taking some online tutorials on VIM text editor through https://www.learnenough.com/text-editor-tutorial. One of the instruction is requiring me to create an alias for the bash profile as shown

~/.bash_profile
alias lr = 'ls -hartl'

and then save it using command as shown

:w.

However every time i tried to save, i get an error message
E17: "/users/atem" is a directory

I have attached a screenshot

Any help to fix this will be greatly appreciated
Thank you
ivo

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