Service 'apigateway:startup' is not operational

Hi All. We got the following error when starting API Gateway. Would any one advise how to solve this problem?

Could not run ‘startup’ [ISS.0026.9102] Service ‘apigateway:startup’ is not operational. To run this service, first recompile the Java source.

Thanks so much

It might be due to the corruption (file) of this service, you can either re-install this package or copy the same from other working environment.

What is your IS version with fix levels?