This message will be shown if the current pending recording hasn't been saved to the Zencastr database. This would indicate that there was a problem when the host created the recording or that the created recording wasn't properly transmitted to the participant when they joined the room. This issue won't be caused by user error. An edge case has been hit that the program wasn't able to handle properly.
Please contact firstname.lastname@example.org if you encounter this problem as it is an internal error that we need to look into. Having the participant refresh the page should cause the application to retry fetching the recording. If that still doesn't work. Creating a new episode as the host and inviting the participant to join this new recording should help work around this issue.