Hi Matthias,

perhaps there is something that I miss. I had the same issue after an upgrade to 7.2.2. coming from 7.0.6, accessing to Digital Asset File Manager and Host Settings. After I downloaded and added FileHelpers all Seems to work fine. The strangeness is that filehelpers.dll was not stored in bin folders until now, so I really does not understand the reason of this strange behaviour. Consider that this error seems to come from digital assets files:

 

Error: File Management is currently unavailable. DotNetNuke.Services.Exceptions.ModuleLoadException: Could not load file or assembly 'FileHelpers, Version=2.0.0.0, Culture=neutral, PublicKeyToken=3e0c08d59cc3d657' or one of its dependencies. Impossibile trovare il file specificato. ---> System.IO.FileNotFoundException: Could not load file or assembly 'FileHelpers, Version=2.0.0.0, Culture=neutral, PublicKeyToken=3e0c08d59cc3d657' or one of its dependencies. Impossibile trovare il file specificato. at System.ModuleHandle.ResolveType(RuntimeModule module, Int32 typeToken, IntPtr* typeInstArgs, Int32 typeInstCount, IntPtr* methodInstArgs, Int32 methodInstCount, ObjectHandleOnStack type) at System.ModuleHandle.ResolveTypeHandleInternal(RuntimeModule module, Int32 typeToken, RuntimeTypeHandle[] typeInstantiationContext, RuntimeTypeHandle[] methodInstantiationContext) at System.Reflection.RuntimeModule.ResolveType(Int32 metadataToken, Type[] genericTypeArguments, Type[] genericMethodArguments) at System.Reflection.CustomAttribute.FilterCustomAttributeRecord(CustomAttributeRecord caRecord, MetadataImport scope, Assembly& lastAptcaOkAssembly, RuntimeModule decoratedModule, MetadataToken decoratedToken, RuntimeType attributeFilterType, Boolean mustBeInheritable, Object[] attributes, IList derivedAttributes, RuntimeType& attributeType, IRuntimeMethodInfo& ctor, Boolean& ctorHasParameters, Boolean& isVarArg) at System.Reflection.CustomAttribute.IsCustomAttributeDefined(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, RuntimeType attributeFilterType, Int32 attributeCtorToken, Boolean mustBeInheritable) at System.Reflection.CustomAttribute.IsDefined(RuntimeType type, RuntimeType caType, Boolean inherit) at System.RuntimeType.IsDefined(Type attributeType, Boolean inherit) at Microsoft.Internal.AttributeServices.IsAttributeDefined[T](ICustomAttributeProvider attributeProvider) at System.ComponentModel.Composition.AttributedModel.AttributedPartCreationInfo.IsPartDiscoverable() at System.ComponentModel.Composition.AttributedModel.AttributedModelDiscovery.CreatePartDefinitionIfDiscoverable(Type type, ICompositionElement origin) at System.ComponentModel.Composition.Hosting.TypeCatalog.get_PartsInternal() at System.ComponentModel.Composition.Hosting.TypeCatalog.GetEnumerator() at System.ComponentModel.Composition.Hosting.AssemblyCatalog.GetEnumerator() at System.Linq.EnumerableQuery`1.GetEnumerator() at System.Linq.EnumerableQuery`1.System.Collections.Generic.IEnumerable<T>.GetEnumerator() at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source) at DotNetNuke.ExtensionPoints.SafeDirectoryCatalog..ctor(String directory) at DotNetNuke.ExtensionPoints.ExtensionPointManager.get_MefCompositionContainer() at DotNetNuke.ExtensionPoints.ExtensionPointManager.ComposeParts(Object[] attributeParts) at DotNetNuke.ExtensionPoints.ExtensionPointManager..ctor() at DotNetNuke.Modules.DigitalAssets.View..ctor() at ASP.desktopmodules_digitalassets_view_ascx..ctor() in c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\dnnprofessional_developer\204bd989\864aa38\App_Web_kj0z2pnr.7.cs:line 0 at __ASP.FastObjectFactory_app_web_kj0z2pnr.Create_ASP_desktopmodules_digitalassets_view_ascx() in c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\dnnprofessional_developer\204bd989\864aa38\App_Web_kj0z2pnr.15.cs:line 0 at System.Web.Compilation.BuildResultCompiledType.CreateInstance() at System.Web.UI.TemplateControl.LoadControl(IWebObjectFactory objectFactory, VirtualPath virtualPath, Type t, Object[] parameters) at System.Web.UI.TemplateControl.LoadControl(VirtualPath virtualPath) at DotNetNuke.UI.ControlUtilities.LoadControl[T](TemplateControl containerControl, String ControlSrc) at DotNetNuke.UI.Modules.WebFormsModuleControlFactory.CreateModuleControl(TemplateControl containerControl, ModuleInfo moduleConfiguration) at DotNetNuke.UI.Modules.ModuleControlFactory.LoadModuleControl(TemplateControl containerControl, ModuleInfo moduleConfiguration) at DotNetNuke.UI.Modules.ModuleHost.LoadModuleControl() --- End of inner exception stack trace ---

In a recent upgrade from older DNN 5.6 up to DNN 7, we encountered this same issue. For us, it was that we had in place an old version of Smith Cart which utilized the FileHelpers​.dll

During the upgrade of DNN over several steps and upgrade of several other modules, we noticed that once we'd crossed DNN 7.1 or 7.2.0 that some but not all of the Admin and Host pages were displaying this message regarding the FileHelpers 2.0

A quick work around was to simply go back to the old Smith Cart install zip, get the FileHelpers.dll ​and place it in the stie's /bin/ folder and restart the site.
That allowed us the time to load the resit of the site for edits/continuing updates and to get into a Smith Cart upgrade too.