Hi, and welcome to the RStudio Community!
I would suggest waiting until January if you want to use YOLO in R, because the brilliant Sigrid Keydana, Andrie De Vries and Kevin Kuo are going to show a working implementation of YOLO in R at the RStudio::conf! Also, currently there are simpler (but not cooler!) ways to do object detection in R than using YOLO.
However, if you a) can't wait until January and b) really want to use YOLO, then let's try to get this fixed, since I'm a big YOLO fan! (though I use YOLO v3 in Python and not Tiny YOLO in R). What error are you getting, exactly? Can you create a reprex?