Error initializing Cordova: Class not found

Just as aharris88 in his answer to this question, I had the [CORDOVA] Error initilizing Cordova: Class not found error message when using Cordova 3.1.0 on my Android dev phone after migrating from Phonegap 3.0.

All fiddling with the config.xml file in the /platforms/android/res/xml directory did not help. Based on the Stackoverflow answer mentioned above, I tried to "start over" by reinstalling Android platform support:

cordova platform rm android
cordova platform add android

After this step it worked again, and I was able to cordova build android && cordova run android without any further problems.

It is config.xml not configs.xml.

Based on the logs I'm seeing you are missing this file in your apps res/xml directory. It is included as part of the distribution at lib/android/res/xml/config.xml so copy that file into your res/xml directory and you should be all set.