Trying to duplicate a project with all its content (cloning it) I get an error
Ouch. Something went wrong on our side! Error: {message}
It works fine when not duplication content 
Hello @solarcity and welcome to the community!
Can you send us an email at support@datocms.com with the email that owns this project and the project ID that is not being able to be duplicated? This way we can take a look at the error on our end
We ended up solving this through email, it was indeed an issue on our end.
Thank you for the feedback!