Your server sent us an empty universal timestamp. Your server's PHP configuration may be faulty. Please contact your server administrator for further assistance.
Why did I receive this error?
There is a problem with the way your web host's server PHP is configured regarding the universal time. Either is has not been set or there is a problem with the way it was set.
What should I do to resolve this?
You will need to check the time configuration on your web server. You may need to contact your hosting company or web developer for assistance.
How do I prevent this error from happening in the future?
Since this is a server issue, there is nothing you can do as a user of CoSchedule or of WordPress.