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AVEVA™ Manufacturing Execution System 2023 R2

Address the 'Failed to retrieve the session key from the MES middleware' error

Address the 'Failed to retrieve the session key from the MES middleware' error

  • Last UpdatedMar 20, 2025
  • 1 minute read

If you receive the following error: 'The JSON value could not be converted to {..}. Path: $.session_key | LineNumber: 0 | BytePositionInLine: 61.' error message, add the following assembly redirection to the Configurator.exe.config which is available in the C:\Program Files (x86)\Common Files\ArchestrA folder.

<runtime>

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

<dependentAssembly>

<assemblyIdentity name="System.Text.Json" publicKeyToken="cc7b13ffcd2ddd51" culture="neutral" />

<bindingRedirect oldVersion="0.0.0.0-8.0.0.5" newVersion="8.0.0.5" />

</dependentAssembly>

</assemblyBinding>

</runtime>

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