Why can't a change my font anymore? (Sony Xperia Z3)

[jordannnnr]

I tried too change my font once, it worked on my rooted Xperia Z3, but I didn't like the font and the emoticons, so I wanted to change it again. So I tried to change it, but I get an error with ifont, and other apps won't reboot. So there is something wrong, please help me with this. Thank you!