Error when trying to "Export Portfolio Items, Users Stories, Tasks ..." #24

When the user tried to export the list using "Export Portfolio Items, Users Stories, Tasks ...", the exported excel file did not have the user stories and the tasks of the epic E2575.

Please find the screenshots of the error in the below file.
Issue With CA Agile.docx

Can you please advise what should be done to export user stories and tasks of the epic E2575?

If further details are required, please do not hesitate to contact me.