A family of Microsoft products that enable users to capture, organize, and reuse notes electronically.
Hello Kimberley,
Welcome to Microsoft Community.
Do you get this error when others are simultaneously working on the same file?
To resolve the issue you may refer to the following Microsoft Article and follow the steps suggested:
Additionally you may refer to this Microsoft Communities thread and check if it helps:
Note: The above suggested information is for Office 365 and Office 2013, however you may follow the same steps for your issue with OneNote 2016.
Hope the above information helps.
Thank you.