I'm doing my first program from channel 9 in JS. The coach used innerText but for me I get the error. I am doing everything as in the tutorial. What is wrong? 0x800a138f - Runtime Error JavaScript code can not set property "innerText" for an undefined or empty appeal. Error in this line:
      document.getElementById("greetingOutput").innerText = greetingString;

 http://msdn.microsoft.com/en-US/library/windows/apps/jj663502

Thanks for your help

Dominik