to find out why it crashes, you could use logcat…
I normally use Eclipse and Logcat there, but if you have installed the App Inventor Software (see also Installing and Running the Emulator), you already have everything you need to use logcat…
How to use Logcat
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connect your device using USB with your computer
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in File Manager go to the App Inventor directory, which is C:\Program Files\App Inventor or similar
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press Shift and right mouse click the subdirectory commands-for-Appinventor to get the context menu
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select " open command window here " and you will get a command window of that subdirectory
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enter adb logcat *:E and the logcat will start running and log all errors
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start your app to elicit the error
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copy the log (see below)
To copy your log, right click, click “select all” and enter to copy the complete log into the clipboard, then open Notepad and paste it using ctrl-v.
Taifun