It says "Excel found unreadable content in ‘file name.xlsx’. Do you want to recover the content of this workbook? If you trust the source of this workbook, click yes.
Thanks for your posting and using Aspose.Cells.
Please download and try the latest version: Aspose.Cells for .NET 8.3.1 and see if it fixes your issue.
If your problem still occurs, then please provide us your source Excel file and sample code replicating this issue with the latest version. We will look into it and help you asap.