Hi there,

It seems like the error you are encountering is related to the chart or graph in your workbook. When you save the workbook using SaveAs, the chart or graph may not be compatible with the new file format, causing the error message to appear.

Here are a few steps you can try to resolve the issue:

1. Check the chart or graph in your workbook to ensure that it is compatible with the file format you are saving it in. You can do this by selecting the chart or graph and going to the "Design" tab on the ribbon. From there, click on "Change Chart Type" and select a chart type that is compatible with the file format.
   
2. Try saving the workbook in a different file format. For example, if you are currently saving it as an XLSX file, try saving it as a CSV file instead.
   
3. Check if there are any add-ins or macros that are affecting the chart or graph in your workbook. Try disabling them and see if the issue persists.
   
4. If none of the above steps work, try recreating the chart or graph in a new workbook and see if the issue persists.

I hope these steps help you resolve the issue. Let me know if you have any other questions or concerns.