Sudoku variable resolution problems

I made it through page 63 and was able to troubleshoot any errors up until then. However, once I added the Menu and Settings… I started receiving multiple errors as followed:

About.java:
setContentView(R.layout.about); about cannot be resolved or is not a field

Prefs.java:
addPreferencesFromResource(R.xml.settings); R cannot be resolved to a variable

*this error is repeated in Sudoku.java whenever R.anything is used. *this started happening in places that were perfectly fine before.

I’ve tried cleaning and I’ve followed the code letter by letter (I think).

Any help is much appreciated!

- KY

Most likely there is a typo in an XML file. Android is unforgiving and Eclipse usually won’t warn you. See this post for diagnostic ideas:

• http://forums.pragprog.com/forums/152/topics/8809

Once you find and fix the problem you may have to run the Project > Clean command.