Projects do not clean after loading

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What steps will reproduce the problem?
1. Loaded projects into Eclipse tried Clean but getting all these errors

[2011-05-24 19:00:29 - ch12-droidinvaders] Unable to resolve target 'android-9'
[2011-05-24 19:00:29 - ch02-hello world] Unable to resolve target 'android-3'
[2011-05-24 19:00:29 - ch11-gl-advanced] Unable to resolve target 'android-9'
[2011-05-24 19:01:16 - ch04-android-basics] ERROR: Unable to open class file 
C:\Zvi\Android Beginning Games 
Development\ch04-android-basics\gen\com\badlogic\androidgames\R.java: No such 
file or directory
[2011-05-24 19:01:17 - ch06-mr-nom] ERROR: Unable to open class file 
C:\Zvi\Android Beginning Games 
Development\ch06-mrnom\gen\com\badlogic\androidgames\mrnom\R.java: No such file 
or directory
[2011-05-24 19:01:18 - ch07-gl-basics] ERROR: Unable to open class file 
C:\Zvi\Android Beginning Games 
Development\ch07-gl-basics\gen\com\badlogic\androidgames\glbasics\R.java: No 
such file or directory
[2011-05-24 19:01:18 - ch08-2d-gamedev] ERROR: Unable to open class file 
C:\Zvi\Android Beginning Games 
Development\ch08-2d-gamedev\gen\com\badlogic\androidgames\gamedev2d\R.java: No 
such file or directory
[2011-05-24 19:01:19 - ch09-jumper] ERROR: Unable to open class file 
C:\Zvi\Android Beginning Games 
Development\ch09-jumper\gen\com\badlogic\androidgames\jumper\R.java: No such 
file or directory
[2011-05-24 19:01:21 - ch10-gl-3d] ERROR: Unable to open class file 
C:\Zvi\Android Beginning Games 
Development\ch10-gl-3d\gen\com\badlogic\androidgames\gl3d\R.java: No such file 
or directory

Windows XP, Eclipse Helios 3.6

Please provide any additional information below.

Original issue reported on code.google.com by zvido...@btinternet.com on 24 May 2011 at 6:05

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P.S. Only one project - Chapter 2 - appears to have built correctly

Original comment by zvido...@btinternet.com on 24 May 2011 at 6:34

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Loaded code after ordering the book from Amazon UK - hoping to resolve this by 
the time the book arrives next week.

Original comment by zvido...@btinternet.com on 24 May 2011 at 6:51

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ISSUE HAS NOW BEEN RESOLVED

Original comment by zvido...@btinternet.com on 25 May 2011 at 5:35

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I have read and coded from the book and am now on chapter 4. I decided to 
import all the source code to a separate workspace and now have the same above 
mentioned problem. All projects contain errors. Only Chapter 2 is built 
correctly.

Original comment by fahadshe...@gmail.com on 7 Jun 2011 at 3:23

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i have the same case, it says that gen is missing in all of them except #2

zvido.. how did you resolve this issue??

Original comment by ali.sam...@gmail.com on 9 Jun 2011 at 6:43

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Hi Ali
The discussion has moved to the author's website (badlogic) forum.
I simply cleaned the projects again and agiain, shutting down and restarting 
Eclipse from time to time, until by themselves they started creating the 
generated R files.
A couple of projects were aimed at SDKs I do not have installed (2.3, 3.0) so I 
had to go into the project properties and cange the targets to 2.2.
Best of luck.

Original comment by zvidor...@googlemail.com on 9 Jun 2011 at 7:26

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I think it would be better if you skipped the step where you switch to another 
workspace since it messes (resets) the ADT settings

Original comment by ajbo...@gmail.com on 15 Aug 2011 at 8:46

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General solution:

1) make sure your Android SDK path is set correctly in your workspace (Window 
-> Preferences -> Android).
2) Create the gen/ folders manually, then refresh the projects in Eclipse.

Original comment by badlogicgames on 24 Aug 2011 at 4:06

• Changed state: Done

[GoogleCodeExporter]

Tested this with Eclipse Indigo in Ubuntu

1. Import all the projects into Eclipse.
2. Restart Eclipse.
3. Edit the file "project.properties" for each of the projects with errors: 
change to "target=android-8" if you have android 2.2 installed. Save the file 
and Eclipse will auto-generate and the error will be resolved.

Original comment by kk7...@gmail.com on 1 Jan 2012 at 4:33