A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Hi CathyBrawner!
I'm Jen, and I'd be happy to help you out with this issue.
When you refreshed your pivot table, it got a new snapshot of your data source and concluded that no longer exists a field with that name, and it can't calculate a field that doesn't exist. To fix the problem, go to the field list in your pivot table and drag your new field into the data area. Please refer to this related thread for more information.
https://answers.microsoft.com/en-us/msoffice/fo...
I hope this information helps. If you have any questions, please let me know and I'd be glad to assist you further.
Best Regards!
Jen :)