[android help] Android SampleBrowserPlugin Installation failed

I am trying to install the samplebrowserplugin given in the android source code. As given here (https://github.com/android/platform_development/tree/master/samples/BrowserPlugin), I am able to follow it to the second step (make SampleBrowserPlugin). I have the .apk file now but when I try to install it using adb, all I get is

Failure [INSTALL_FAILED_DEXOPT]

When I run logcat, among various messages, I see

DexOptZ: zip archive '/data/app/com.android.sampleplugin-1.apk' does not include classes.dex

.

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