My probot applications throw the following error on running.
Expiration time' claim ('exp') must be a numeric value representing the future time at which the assertion expires
I have done the following already
Screenshot

What is your probot's version?
Probot v6.1.0
@Nischay-Pro I've seen this when your webhook secret is not the same as what's defined in the GitHub App settings. If you've double checked all your env variables and the webhook secret, the other possibility is the time on your server is not in sync.
@tcbyrd Yep. My system time was out of sync with server time by 1 minute. Resyncing fixed it.
@Nischay-Pro how did you re-sync your system with the server?
Most helpful comment
@tcbyrd Yep. My system time was out of sync with server time by 1 minute. Resyncing fixed it.