Describes the cause and action for error messages.
Error Message(English)：
an unexpected error has occurred
[Solved] How to Solve Excel Error “An Unexpected Error has Occurred ...
http://www.repairmsexcel.com/blog/top-5-fixes-an-unexpected-error-has-occurred-when-exporting
3 Reliable Fixes to Repair Excel Unexpected File Error
http://www.repairmsexcel.com/blog/troubleshoot-excel-an-unexpected-error-has-occurred
SharePoint Online から Excel にエクスポートすると “An unexpected error ...
https://support.microsoft.com/ja-jp/help/4475770/unable-to-export-to-excel-from-sharepoint-online
Excel 2010: An unexpected error has occurred when opening ...
https://social.technet.microsoft.com/Forums/ja-JP/b7eab515-dd71-493f-bad6-a47349b118f3/excel-2010-an・・・
Sharepoint data connection error "An unexpected ...
https://social.technet.microsoft.com/Forums/office/en-US/e99bcd20-14f7-445a-ac46-6a27696f1cb8/sharep・・・
An Unexpected error has occurred. AutoRecover ...
https://social.technet.microsoft.com/Forums/office/en-US/5c1d2209-106b-4b64-83bf-6e7c3db9f4f9/an-une・・・
SharePoint 2013 Export To Excel - "An unexpected error has occurred ...
https://stackoverflow.com/questions/45723175/sharepoint-2013-export-to-excel-an-unexpected-error-has・・・
How to Repair Excel file Unexpected Error - Recoverit Data Recovery
https://recoverit.wondershare.com/office-file-recovery/how-to-repair-excel-file-unexpected-error.htm・・・
AutoRecover "an unexpected error has occurred......in Excel 2003 h ...
https://www.pcreview.co.uk/threads/autorecover-an-unexpected-error-has-occurred-in-excel-2003-h.2270・・・