Stop wasting your time with that stupid function, period. Just mask it like a normal person. https://www.damiensymonds.net/2010/10/shift-while-brushing.html
Image Processor is really fussy. You have to have exactly the same versions of Photoshop and Bridge running. If you have the latest Bridge but not the latest Photoshop, or vice versa, it won't work.
Oh hell. The little girl's pony tail is the problem.
Did you capture another photo of her pony tail at a similar angle against white? Or even the grey wall colour?