Receiving Excel export error

When exporting to Excel I receive the following error

Attempt by security transparent method 'NPOI.OpenXml4Net.OPC.ZipPackage..ctor(System.IO.Stream, NPOI.OpenXml4Net.OPC.PackageAccess)' to access security critical method 'ICSharpCode.SharpZipLib.Zip.ZipInputStream..ctor(System.IO.Stream)' failed.

Assembly 'NPOI.OpenXml4Net, Version=, Culture=neutral, PublicKeyToken=0df73ec7942b34e1' is marked with the AllowPartiallyTrustedCallersAttribute, and uses the level 2 security transparency model.  Level 2 transparency causes all methods in AllowPartiallyTrustedCallers assemblies to become security transparent by default, which may be the cause of this exception.


Hello Michael

what is the mime-type of your download?

Best regards,