Site Health – Scheduled event

HI,
I got this error from the Site Health Screen saying that “A scheduled event has failed”.

Message says:
“The scheduled event, wpephpcompat_start_test_cron, failed to run. Your site still works, but this may indicate that scheduling posts or automated updates may not work as intended.”

The error message keeps changing but I think its got something to do with the cron file.
I’m not sure how to fix this. Could someone give me some advice?
Thanks.