Getting two messages: "loading file..." and "Unable to load file" from sample USB_HOST app for STM32F767ZI USB_HOST app.

But I can't figure out why I'm getting these messages. I've run searches for the messages from the SWST32 search option and they aren't to be found. So, I'm stuck.   I'm trying to work with the USB_HOST sample app for STM32F767ZI Nucleo board.  I've searched for the messages in the code but can't find them.  Need help.  I'm stuck.