title: In-App Billing Android and bug
body: <p>Good evening, everybody.
  I'm trying to debug the In-App Billing project. The sourse which I use, is </p>
  
  <p><a href="https://github.com/blundell/SimpleInAppPurchaseV3" rel="nofollow">https://github.com/blundell/SimpleInAppPurchaseV3</a></p>
  
  <p>I'm facing the problem from time to time:
  Suddenly the project in file Log.java gives two errors:
  1. The type java.lang.Object cannot be resolved. It is indirectly referenced from required .class files
  The error shows near the first symbol of the file.</p>
  
  <ol>
  <li><p>R.java cannit be resolved! And gen-folder doesn't recreate! No errors in xml-files.</p></li>
  <li><p>IabHelper.java shows the error: The import com.android.vending.billing.IMarketBillingService cannot be resolved
  So if delete com.android.vending.billing/IInAppBillingService.aidl file and recreate it (by copy-paste) nothing happens.</p></li>
  </ol>
  
  <p>What am I doing wrong?</p>