By the way, this tip may come in handy for any project you do: When you see a message and you have no idea where it comes from, then try to recursively search through all files starting from the root directory of your project for some of the words you're seeing.
In linux you can use the "grep" command for this and do a recursive search through
grep -R "pattern" "root_dir"
You often won't find the full word/phrase you are looking for, but there's a high chance you'll find individual words that can lead you to what you need to find.
