Unable to install Runtime.apk to Android emulator

Using the AIR 3.9 SDK and running Android emulator (any):

     call adt -installRuntime -platform android

     Failure [INSTALL_PARSE_FAILED_NO_CERTIFICATES]

Does this mean that the Runtime.apk included with AIR 3.9 was packaged without a certificate, rendering it useless? Or am I doing something wrong?

I know captive-runtime apks are preferred, but they don't seem to run on Android emulators prior to armeabi-v7a.