Hi,
I'd suggest creating a backup before trying anything.
You can try the following methods to fix the issue:
- Click on the "Continue" button. This allows Excel to attempt to repair the file and save it with potentially removed or repaired features.
- If the error persists after the repair attempt, try saving the file with a different name.
- Disable any add-ins that you have installed and try saving the file again.
- If the error persists, you can try repairing the Excel installation. Open the Control Panel, go to "Programs and Features" (or "Add or Remove Programs"), locate Microsoft Office or Excel in the list of installed programs, right-click on it, and choose the repair option.
Also, refer to this article on How to fix Errors were detected while saving Excel .
Best Regards.