I just completed all of the code in Chapter 5 to create the InputHandlerDemo, but every time I try to run it on my phone, the screen goes blank for a few seconds before crashing back to the start screen. I used WinMerge to compare my code with the source downloaded from this site, and as far as I could tell, all of the differences were cosmetic (extra spaces or line breaks, misspellings in comments). Just to be on the safe side, I copied the source code version over my code, but it's still crashing. Has anyone else run into this?

D'oh! I was missing Display.spriteFont. That fixed it.