Hi,
Thank you for reaching out here in the DocuSign Community.
I am sorry to hear that you have been unable to send your document due to this error, but I'll gladly help you get to the bottom of the issue.
Upon some research, I was able to find several cases in which this error appeared due to having the Standards Based Signatures and Markup features enabled at the same time.
In order to confirm if this applies to your case we will need to take a closer look at your account setup.
To prevent any personal information from being compromised throughout the interaction, please open a new support case to move forward with the process.
https://support.docusign.com/en/contactSupport
If you are not able to open the case on the same page, you should scroll down to More Support Options and select "I can't reset my password or don't have an account." you will have the option of filling out the form or calling Support.
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
"Select as Best" below if you find the answer a valid solution to your issue!
Dear Alejandro, thank you for your quick reply. I have since found out that the error must be in the template I had used. Without template the sending of the documents works. If the error still occurs again, I will open a new support case.