Hi,
I upgraded Nop4.5 to 4.6 and noticed that all of the Nuget Packages needed to be updated,
I was successful in upgrading all of them, except for ClosedXML.

Reading the Migration Notes for it provided some guidance and the new Strongly typed requirements.  I tried to set the Value.ToString() and removed the errors; however, the results at run-time failed to generate the Excel sheet.

ClosedSMS GIT Migration Link:  
https://closedxml.readthedocs.io/en/latest/migrations/migrate-to-0.100.html

Would you please consider upgrading Nop.Services to the latest version of ClosedXML 0.100?

Thank You!