Fonts warnings

Hi
I have some warnings in my game , but when I build and run on my phone it runs fine
1- What could be the reason for these warnings and is there a way to fix them ??
2- Do these warnings will have an effect on the app to cause some weird behavior or crashes on some devices?

OK thank you very much I downloaded fresh fonts and replace with old ones and the Problem is solved !

The latest 2017.2