Unable to instantiate activity ComponentInfo

Ao correr aplicação no emulador android ocorre o seguinte erro:

04-04 16:36:36.188: I/dalvikvm(402): Failed resolving Lcom/humihara/trampoline/MainActivity; interface 1137 'Lcom/humihara/trampoline/IActivityRequestHandler;'
04-04 16:36:36.188: W/dalvikvm(402): Link of class 'Lcom/humihara/trampoline/MainActivity;' failed
04-04 16:36:36.208: D/AndroidRuntime(402): Shutting down VM
04-04 16:36:36.208: W/dalvikvm(402): threadid=1: thread exiting with uncaught exception (group=0x40015560)
04-04 16:36:36.248: E/AndroidRuntime(402): FATAL EXCEPTION: main
04-04 16:36:36.248: E/AndroidRuntime(402): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.humihara.trampoline/com.humihara.trampoline.MainActivity}: java.lang.ClassNotFoundException: com.humihara.trampoline.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.humihara.trampoline-1.apk]

Resolução:
No Eclipse mudar Preferences->Compiler->JDK Compliance->Compiler Compliance Level para 1.6.