[Plugin: Ninja Forms Lite] Error loading CSS file all-black.css

I don’t know if anyone else is having this problem, but I find it on all the sites I install Ninja Forms Lite on. Whenever the page loads, I get an error stating that the browser could not find the following file, and I have to rename the css file black.css to all-black.css.

Here is the error I get in firebug:
“NetworkError: 404 Not Found – http://www.ninjaforms.com/wp-content/plugins/ninja-forms/css/tooltips/all-black.css?ver=3.4.1”

http://wordpress.org/extend/plugins/ninja-forms/