When I tried to do a simple modification of the "hello android" program that eclipse adt plugin generates I get error and can't get the program to run again even if I restore the file to its original contents. The modification was that I changed a string in strings.xml. the line was:

<string name="app_name">Todo List</string>

and the app was runnable, then I changed it to

<string name="app_name">Todo List1</string>

and it was an error:

[2010-04-21 23:18:03 - Todo_list] Error in an XML file: aborting build.

And a new empty file also showed up called: strings.out.xml And then I can't get the prrogram back into runnable state even if I delete the empyt file and restore the original line, I'm a confused beginner of java, android and eclipse.