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Cannot Create an instance of the following .NET Framework object

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I have inherited a code base for Business Central on-prem.

The code calls into FluentFTP dll to transport data files.

This code has more or less remained the same with small changes for each new Business Central iteration.

We are currently trying to get BC22 compliant, but cannot get an instance of FluentFTP (or any other assembly) to instantiate.

The code base will fully compile and publishes without errors.

Steps we've taken so far:

Updated to .Net Framework 6
Updated FluentFTP.dll to the new version 48.0.0.0
Added Probing paths for new .Net assembly

Current constructor

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YUN ZHU 93,834 Super User 2025 Season 2 on at

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Cannot Create an instance of the following .NET Framework object

Hi, if it is Business Central 2023 wave 1 (BC22), it should be related to the update below. I hope the following information can give you some tips.

https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/upgrade/deprecated-features-platform?wt.mc_id=DX-MVP-5004336

Migrating from .NET Framework to .NET Standard

https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/developer/devenv-migrate-from-dotnet-framework-to-dotnet-standard?wt.mc_id=DX-MVP-5004336

Thanks.

ZHU

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Cannot Create an instance of the following .NET Framework object

For more clarity, I have attempted to migrate the references to .NET 6.

After installing .net 6, the probing paths within settings.json point to those assemblies:

"al.assemblyProbingPaths": [

"./.netpackages",

"C:\\Program Files\\dotnet\\packs\\Microsoft.NETCore.App.Ref\\6.0.23\\ref\\net6.0",

The runtime version is pointing to .net 6 in the app.json

"runtime": "6.0",

2 of the 4 assemblies work correctly when references, the other 2 throw the original error message.

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