Upgrade from 7.0.6 to 7.1 causes this error when going to the File Manager. "FileHelpers" is not referenced in the web.config nor is there a file by that name.

How do I fix this?

Thanks.

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. The system cannot find the file specified. ---> System.IO.FileNotFoundException: Could not load file or assembly 'FileHelpers, Version=2.0.0.0, Culture=neutral, PublicKeyToken=3e0c08d59cc3d657' or one of its dependencies. The system cannot find the file specified. 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.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() at __ASP.FastObjectFactory_app_web_azghy1ir.Create_ASP_desktopmodules_digitalassets_view_ascx() 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 ---