Q:

UIAutomation failed to tap a key

i use UIAutomation and instrument for my UI Tests and when i try to tap some letters, instrument return me an error:
Script threw an uncaught JavaScript error: target.frontMostApp().keyboard() failed to tap 'V' on line 27

A part of code:
passwordField.tap();
target.frontMostApp().keyboard().typeString("VEMO");

Has anyone some ideas about it?
Thank

A:

There is an undocumented function that exists on the UIAKeyboard object that will help you avoid this problem. 
var keyboard = target.frontMostApp().keyboard();
keyboard.setInterKeyDelay(seconds);
keyboard.typeString("VEMO");

You can push the delay up as high as you want but I found that a delay of 0.1 was enough to prevent the keyboard from failing. 

