Hi Roel,
Welcome to the DocuSign Community!
We are glad to have you here and can't wait to help share as much knowledge as possible.
I am sorry to hear that you haven’t been able to send your envelope due to this error, but I will assist in solving it.
To start troubleshooting I suggest accessing your Draft Envelope in Manage>Drafts through a different device, and browser. If the first option fails, you can try copying your draft.
In the case that non of these options work for you, the envelope will need to be recreated.
Feel free to let us know if you need further assistance with this.
Thank you for using DocuSign, we hope you have a wonderful rest of your day!
Best regards,
Alejandro R. | DocuSign Community Moderator
Please click "Best Answer" below if you find my reply to be a valid solution to your issue!