VS2015: Unable to cast COM object of type 'System.__ComObject' to interface type 'IFabricTestManagementClient4'


I am using VS2015 for this particular project but also using VS2017 for other projects.

Installed: Microsoft Azure Service Fabric SDK - 4.0.466.9590

VS Project Target framework: .NET Framework 4.6.2

VS reference System.Fabric: Runtime Version v4.0.30319 - Version

When I try to debug the application in VS2015, it turns out that it's throwing an exception when:

Unable to cast COM object of type 'System.__ComObject' to interface type 'IFabricTestManagementClient4'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{B96AA7D4-ACC0-4814-89DC-561B0CBB6028}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).

Can you help how to debug/resolve this issue?

asked on Stack Overflow Feb 10, 2020 by luka032

1 Answer


This is usually caused by a mismatch between the service code + nuget packages and the software version of the cluster.

The easiest way to fix, is to update everything to the latest version.

answered on Stack Overflow Feb 11, 2020 by LoekD

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