Stuck - can't open BBS anymore

Hi! I have a rooted Xperia z3 compact running android 5.1.1

I installed better battery stats and it asked me to install the compaion app. I did it, and then I rebooted the phone. But when I try to open it, I find it stuck like in this screenshot. I can't use the app neither if I unistall the whole program, it turns out to stuck again there. If I unistall the compaion app, the app crashes. What is happening?

Thanks!

Spoiler: screenshot

https://www.dropbox.com/s/urc0mnqup4...08-34.jpg?dl=0