2009 GZ 250 makes a scraping noise when it accelerates

[Dekanem]

It just started a couple days ago, but when I accelerate there is some sort of scraping noise, like something on the back tire has something stuck to it or something shifted...however, when I pull in the clutch the noise disappears.

I did a visual inspection and found this small rubber hose hanging, problem is I have no idea where it came from.
Please help!