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Force Close Error

Hi friends,
im new to android development, and did my first application just now.
But when i run it in simulator it shows a message "Sorry The application has stopped unexpectedly. Please try again. [Force Close]". My application just contains a textbox and listbox. just add the string in text box to listbox. i got it from a textbook.

How to solve this? I think its a silly thing for most of you...
Thanks in advance....
 

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