SampleService Demo App error

Hi guys,
I was trying out the Sample Service demo app "Profiles App". I uploaded the app and the service file to the gateway. But when I try to enable the service, it gives an error "We were unable to enable SampleService"
and in the log it shows "Halting service SampleService, there must be a single method annotated with @AWServiceStartupComplete, we found 0"
Please tell me how to fix this.
Thanks in advance

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