I just found this error when deploying my Marmalade App to Android.
As it’s explained on this thread, we need to supply a default generic icon, apart from the android-specific icon options (like android-icon-xhdpi).
For those using the hub, there is a solution in the previously mentioned thread. For those who, like me, still use .mkb files, this is how I’ve solved it.
... rest of the mkb
Deploy tool is not complaining about this anymore 🙂