Can't find keyplane that supports type for keyboard

问题

I have UITextField for entering e-mails. All is work - but I have this issue in debugger terminal:

Can't find keyplane that supports type 7 for keyboard iPhone-Portrait-Emoji-Email; 
using 1582125428_Portrait_iPhone-Emoji-Keyboard_Letters

How can I fixed it?

来源：https://stackoverflow.com/questions/27798912/cant-find-keyplane-that-supports-type-for-keyboard