I investigated the projects you sent me. You aren't doing anything wrong. I found an issue in adding/editing configuration files when there is more than one project in the solution. The issue is:
1) you adds a configuration file in one of the projects - works OK
2) then you try to add the same type of config file in the other project - fails with an error
I noticed that in your particular case this configuration file is under TestApp/App_Resources/Android/xml/config.xml. If you try to add the same file (using Edit Configuration context menu) in TestApp2 project, this results in error. However, if you try to add some of the other config files, it works fine.
You can work-around this situation by adding the corresponding config file manually by using the built-in Add Existing Item feature.
We apologize for the inconvenience. We have logged this issue in our bug tracking system and we'll provide a fix in an upcoming release.
Ivan K. Ivanov
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