Reference to type 'ExcelStorageBase' claims it is defined in 'FileHelpers', but it could not be found

[ferdaousHar]

Hello Marcos,

I try to upgrade my solution from .Net Framework to .Net 6 and I have an error with FileHelpers saying that :
Reference to type 'ExcelStorageBase' claims it is defined in 'FileHelpers', but it could not be found
I install nuget packages :
FileHelpers.ExcelNPOIStorage and FileHelpers (version 3.3.0) and even when I upgrade to last versions I get same error.
Would you please help me ?

Regards.