Cannot find package value in AndroidManifest.xml for module

When compiling an Android module with Intelij-IDEA I get the following error message:

Cannot find package value in AndroidManifest.xml for module

The hover help tell me to fill in the Resources page on settings dialogue. But, what actually do I have to fill in?

The Manifest file is pretty sort (it's a library)

<manifest
  android:versionCode='1'
  android:versionName='0.1'
  package='com.XXX.datamodel'
  xmlns:android='http://schemas.android.com/apk/res/android'
>
  <uses-sdk
    android:minSdkVersion='4'
    android:targetSdkVersion='8'
  ></uses-sdk>
</manifest>