Asset store: "Title contains linefeed"

What am I doing wrong here?

I’m trying to get a package ready for the Asset Store and trying to upload a key image or preview the thing just gives me an error “Title contains linefeed”.

I tried changing the title of the package several times, removing formatting from the description, but its not going away.

Here is an image:

Did you copy/paste you title in from somewhere? If so, try erasing and typing out the title again

Bingo, that did it.

Indeed, I tried to copy paste the title in.
I deleted the entire package and started over and now it works. Thanks.