Here's what I think happened. You created your first Ruby application
called "profile".. it generated successfully and terminal opened up the
directory. Now you want to create another rails app, but terminal is
still in that rails directory of "profile" (hence the name profile next
to your imac's name).
To get out of it, type "cd ~/Desktop" (which stands for "change
directory" and that will change the directory to your desktop. Then type
"rails new {name}" for your next app, and it should work again!
If you find yourself having trouble with this, I recommend going through
the first chapters of the Rails Tutorial book by Michael Hartl. If I
remember correctly, he discusses the command prompts and other stuff
around ruby and rails at great lengths.
Let me know if this worked out for you, otherwise we'll have to find
another solution!
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