You are getting that WARNING message because either the process got killed or the box got recycled without having stopped Apache.
Usually Apache is smart enough to clean up the mess; does it starts?
Yes?... so... what's the problem?
Just be nice and next time stop Apache before rebooting the system.
Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.
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