A family of Microsoft products that enable users to capture, organize, and reuse notes electronically.
Hi,
Thanks for posting in our community and I'm glad to offer any possible support.
Based on the description, we do understand that you got an error message when trying to create a section in your notebook. As this thread is post in Other category, may I first confirm your system environment and version? We have different troubleshooting steps for Windows and Mac system and specific system version may cause a difference for OneNote product.
Meanwhile, we may need the following details to better understand the scenario and offer the appropriate suggestions.
1.Regarding to this error message, do you remember where the issue notebook was created in? Some other users who encountered with the same error is because the notebook was created in OneNote 2010. If so, follow steps in the official article: Resolve the "This section was originally created in an older version of OneNote" error (microsoft.com) or check this similar thread: Opening older versions of notes from OneNote 2016 - Microsoft Community.
2.If issue persists or the notebook is created in OneNote 2016, May I know what is the current version of OneNote app? In Windows, it's in File>Account. In Mac, it's in OneNote>About OneNote.
3.If the same issue will happen when you create a new notebook and new sections in there?
At meantime, I suggest you can go to OneNote for the web to open this notebook, then try to create a new section from OneNote for the web and see whether you can add this section successfully. This can ensure whether the problem is related to the notebook itself or the local OneNote application.
Look forward to get any updates from you as I will try my best to resolve the issue for you. Have a nice day!!
Best Regards,
Mia