“ngg_delete_expired_transients” failed to run

Hi,

I’ve recently moved to your NextGen Gallery plugin, but am now experiencing a problem with WordPress Site Health tht wasn’t there before:

Site Health Status
The site health check shows critical information about your WordPress configuration and items that require your attention.

1 recommended improvement
A scheduled event has failed Performance
The scheduled event, ngg_delete_expired_transients, failed to run. Your site still works, but this may indicate that scheduling posts or automated updates may not work as intended.

I’m not sure what’s going on and have tried clearing the cache, but I still get the same error.

Any idea how to fix this problem?

Thanks