Invalid Worksheet Issue

Cause of the Issue

This issue is caused by one or more empty sheets in the workbook. Excel doesn't support export of empty worksheets. (Due to the specifics of Excel's internal structure, even export of a single non-empty sheet will be disrupted if an empty sheet is present elsewhere in the workbook.)

How to Resolve

To fix this issue for any empty worksheet, you must either:

1. Delete the worksheet.
2. Insert data into the worksheet.

After taking one of the above actions, the issue will be resolved when AccessibilityAssistant next evaluates the workbook.