Cannot build even the most basic help ....

I keep getting an error (from "MRefBuilder") about a missing "Newtonsoft.Json" reference - which is really odd, because I do have that file - just in a more recent version:

[Sandcastle Help File Builder and Tools, version 2015.10.10.0]
Creating output and working folders...
Finding tools...
The Sandcastle tools are located in 'C:\bin\Sandcastle\'
Locating components in the following folder(s):
    C:\work\mds-test\Sandcastle
    C:\ProgramData\EWSoftware\Sandcastle Help File Builder\Components and Plug-Ins\
    C:\bin\Sandcastle\
Framework reflection data location: C:\bin\Sandcastle\Data\.NETFramework
Using presentation style 'VS2013' located in 'C:\bin\Sandcastle\PresentationStyles\VS2013'
Loading and initializing plug-ins...
Lightweight Website Style Version 2015.10.10.0
Copyright © 2006-2015, Eric Woodruff, All Rights Reserved
Portions Copyright © 2014, Sam Harwell, All Rights Reserved
-------------------------------
Clearing working folder...
-------------------------------
Clearing any prior web/markdown output...
-------------------------------
Validating and copying documentation source information
Source: C:\work\mds-test\mds\mds.csproj
    Found project 'C:\work\mds-test\mds\mds.csproj'

Parsing project files
    Found assembly 'C:\work\mds-test\mds\bin\mds.dll'

References to include (excluding framework assemblies):
    AjaxControlToolkit, Version=4.1.60919.0, Culture=neutral, PublicKeyToken=28f01b0e84b6d53e, processorArchitecture=MSIL
    ASPNETExpert.WebControls, Version=4.0.0.35631, Culture=neutral, PublicKeyToken=35f3f9e6d8f8617d, processorArchitecture=MSIL
    CsvHelper
    DotLiquid, Version=1.8.0.0, Culture=neutral, PublicKeyToken=82e46016ecf9f07c, processorArchitecture=MSIL
    Elmah, Version=1.2.14706.0, Culture=neutral, processorArchitecture=MSIL
    log4net, Version=1.2.13.0, Culture=neutral, PublicKeyToken=669e0ddf0bb1aa2a, processorArchitecture=MSIL
    Microsoft.ReportViewer.Common, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL
    Microsoft.ReportViewer.DataVisualization, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL
    Microsoft.ReportViewer.ProcessingObjectModel, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL
    Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL
    Newtonsoft.Json, Version=7.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL
    Nowhow.Common, Version=4.1.4.0, Culture=neutral, processorArchitecture=MSIL
    Renci.SshNet, Version=2013.4.7.0, Culture=neutral, processorArchitecture=MSIL
    scs-business-commons, Version=2.0.0.0, Culture=neutral, processorArchitecture=MSIL
    System.Net.Http.Extensions, Version=2.2.28.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL
    System.Net.Http.Formatting, Version=5.2.3.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL
    System.Net.Http.Primitives, Version=4.2.28.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL
    System.Web.Http, Version=5.2.3.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL
    System.Web.Http.WebHost, Version=5.2.3.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL

Copying XML comments files
    C:\work\mds-test\mds\bin\mds.XML -> C:\work\mds-test\Sandcastle\Help\Working\mds.XML
-------------------------------
Generating shared content files (en-US, Englisch (USA))...
    Last step completed in 00:00:00.0280
-------------------------------
Generating API filter for MRefBuilder...
    Last step completed in 00:00:00.0310
-------------------------------
Generating reflection information...
[C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe - GenerateRefInfo.proj]
Der Buildvorgang wurde am 29.03.2016 12:37:01 gestartet.
Projekt "C:\work\mds-test\Sandcastle\Help\Working\GenerateRefInfo.proj" auf Knoten "1" (Standardziele).
PrepareForBuild:
  Das Verzeichnis "obj\Debug\" wird erstellt.
GenerateRefInfo:
  MRefBuilder (v2015.10.10.0)
  Copyright ¸ 2006-2015, Microsoft Corporation, All Rights Reserved.
  Portions Copyright ¸ 2006-2015, Eric Woodruff, All Rights Reserved.
  Loaded 1 assemblies for reflection and 22 dependency assemblies.
MRefBuilder : error : Unresolved assembly reference: Newtonsoft.Json (Newtonsoft.Json, Version=6.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed) required by System.Web.Http [C:\work\mds-test\Sandcastle\Help\Working\GenerateRefInfo.proj]
    Last step completed in 00:00:02.6101
-------------------------------

SHFB: Error BE0043: Unexpected error detected in last build step.  See build log for details.
   bei SandcastleBuilder.Utils.BuildEngine.TaskRunner.Run(String processFilename, String targetFile, String arguments)
   bei SandcastleBuilder.Utils.BuildEngine.BuildProcess.Build()

I have an "assembly binding redirect" section in my "web.config" file - and I also manually added those "" sections to the Sandcastle.Gui.exe.config and the Mrefbuilder.exe.config - but to no avail. I cannot build ANYTHING right now..... (even just a single DLL cannot be handled.....)

Any ideas?

EWSoftware / SHFB

Cannot build even the most basic help .... #276