I have a Caliburn.Micro application with many projects. Several projects refer to the same dll in a separate folder. Now I needed to replace that dll with a newer version. I
My guess is that you need to add references to other assemblies.
Please attach the text of the csproj to show the reference to the dll you updated.
Assemblies can reference other assemblies that aren't required to compile but are required at runtime. You need to determine if FileHelpers
is the assembly you explicitly referenced. Please see the following links on how to use Fusion Log Viewer. It will give you information on where it is looking to find assemblies.