Interop COM not working with MultiTerm 2021 and 2022 - HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)

Question

When trying to use the Interop COM interface and create an Application instance, I always get the following error message (as if there is no MultiTerm installed on the system): 
 The COM class factory for the component with CLSID {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} could not be retrieved due to the following error: 80040154 Class not registered (exception of HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)). at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck) at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) at System.Activator.CreateInstance(Type type, Boolean nonPublic) at System.Activator.CreateInstance(Type type) at RWS_MultiTerm_Interop_Test.frmMain.InitMultiTerm() in <PATH TO SOURCE FILE>:line 228. 
 
 A MultiTerm repair installation, as well as a complete reinstallation, has already been attempted. Likewise, testing has been done on multiple systems and with multiple MultiTerm versions, which are: 
 
 MultiTerm 2021 SR2 - 16.2.1.1044 
 MultiTerm 2022 SR1 - 17.1.1.2185

Microsoft Windows 7 Enterprise version 6.1.7601 Service Pack 1 Build 7601 
 Microsoft Windows 10 Pro Version 10.0.19045 Build 19045 
 Microsoft Windows 11 Pro Version 10.0.22621 Build 22621

Daniel Brockmann · Answer

Hello Raimo Geisel - sorry for the late follow up here. Without seeing your code, we can try following a best guess. The GUID you put here corresponds to MultiTerm 2019 so you may have an old GUID that is not valid for new MultiTerm versions. We always use new GUIDs for major releases so there are two new ones for MultiTerm 2021 and 2022. It might be best to use names instead of GUIDs, like 
 MultiTerm160.TMO.Application for MultiTerm 2021 or 
 MultiTerm170.TMO.Application for MultiTerm 2022 Patrick Andrew Hartnett FYI also. 
 Thanks, Daniel

Patrick Andrew Hartnett · Answer

HI Raimo Geisel , 
 Thank you for providing access to your project code. I see that you are using a simple integration of the Sdl.MultiTerm.TMO.Interop assembly. 
 I recommend to download the sample projct Multiterm Search Example , that has a working integration of Sdl.MultiTerm.TMO.Interop, much the same as the project code you provide me. Possibly, create a clone of this project and adapt it for your requirements. 
 let me know how it goes,

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Interop COM not working with MultiTerm 2021 and 2022 - HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)

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