This message appears when your account doesn't have sufficient credits to complete the video generation.
When you see this message:
Check your credit balance and the duration of the video you are attempting to generate.
If your account shows that you have enough credits to generate the video but you are still seeing this message, please contact the Support Team.
If you do not have enough credits to generated the video you will need to upgrade your Synthesia plan or wait until your billing cycle renews.
Notes:
To learn more about how to check your real time minute balance, see the Where can I see my current credits in Synthesia article.