[android-developers] contentView Required

Hello,

regarding the trace dump following, what does mean 'contentView
required' ?

__________________
java.lang.RuntimeException: Unable to create service
com.comp.app.MyService: java.lang.IllegalArgumentException:
contentView required: pkg=com.comp.app id=1 notification=Notification
(vibrate=null,sound=null,defaults=0x0)
_________________________

Thanks

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