Form created in AX 2012 RTM or AX 2012 R2 with ManagedHost control on its design fails to open on AX 2012 R3

Applies to AX 2012 R2 & AX 2012 R3

Consider the following scenario:

When a form is created in AX 2012 RTM or AX 2012 R2 and a ManagedHost control is added on its design,

like “Microsoft.Dynamics.AX.Framework.Client.Controls.ChartToolBar”.

Then when the form is deployed on a newer AX version, e.g. AX 2012 R3 environment,

 the form no longer opens but throws the following exception:

Could not load file or assembly ‘Microsoft.Dynamics.AX.Framework.Client.Controls, Version=,
Culture=neutral, PublicKeyToken=31bf3856ad364e35′ or one of its dependencies.
The located assembly’s manifest definition does not match the assembly reference.

(Exception from HRESULT: 0x80131040)

To resolve the above addressed issue, especially in an upgrade scenario where many forms are affected, you can do the following:

Adding new assembly bindings into Ax32.exe.config to redirect and references to assembly.

Here is what precisely you need to do:

-Shutdown your AX client

-Find the “Ax32.exe.config” file under your Client\Bin directory, normally under

 “C:\Program Files (x86)\Microsoft Dynamics AX\60\Client\Bin”

-Edit the file in Notepad and add the following assembly binding (Highlighted in yellow).

-Save the file, but please make sure to keep it in the original format

-Start AX client and try your scenario 

The Ax32.exe.config file content will look like the following after the changes:


<?xml version=”1.0″ encoding=”utf-8″ ?>


    <startup useLegacyV2RuntimeActivationPolicy=”true”>

        <supportedRuntime version=”v4.0.30319″ />

        <requiredRuntime version=”v4.0.30319″ safemode=”true”/>



        <assemblyBinding xmlns=”urn:schemas-microsoft-com:asm.v1″>

            <probing privatePath=”EditorComponents”/>


                <assemblyIdentity name=”Microsoft.Dynamics.AX.Framework.Client.Controls”

                                                                   publicKeyToken=”31bf3856ad364e35″ culture=”neutral” />

                <bindingRedirect oldVersion=”″ newVersion=”″ />



                <assemblyIdentity name=”ste-net” publicKeyToken=”5542884f620dbde5″ culture=”neutral” />

                <bindingRedirect oldVersion=”″ newVersion=”″/>