How to repair COMException error 80040154

Question

Moving a working C  project from a 64-bit Windows 7 machine to a 32-bit XP machine caused the following error      Retrieving the COM class factory for component with CLSID  681EF637-F129-4AE9-94BB-618937E3F6B6  failed due to the following error  80040154    681EF637-F129-4AE9-94BB-618937E3F6B6 is not in the registry so it is not properly installed  but this is same ID that was previously a problem on the 64-bit Windows 7 machine   The solution to this error on the 64-bit Windows 7 machine was found here  change Platform Target to x86  but this does not solve the problem on the 32-bit XP machine   How do I find the DLL associated with 681EF637-F129-4AE9-94BB-618937E3F6B6  or  even better  how do I repair this exception

User · Answer

I had the same issue in a Windows Service. All keys where in the right place in the registry. The build of the service was done for x86 and I still got the exception. I found out about CorFlags.exe

Run this on your service.exe without flags to verify if you run under 32 bit. If not run it with the flag /32BIT+ /Force (Force only for signed assemblies)

If you have UAC turned you can get the following error: corflags : error CF001 : Could not open file for writing Give the user full control on the assemblies.

Console output

User · Answer

Move excel variables which are global declare in your form to local like in my form I have   Dim xls As New MyExcel Interop Application   Dim xlb As MyExcel Interop Workbook   above two lines were declare global in my form so i moved these two lines to local function and now tool is working fine

User · Answer

To find the DLL  go to your 64-bit machine and open the registry  Find the key called HKEY CLASSES ROOT CLSID  681EF637-F129-4AE9-94BB-618937E3F6B6  InprocServer32  This key will have the filename of the DLL as its default value   If you solved the problem on your 64-bit machine by recompiling your project for x86  then you ll need to look in the 32-bit portion of the registry instead of in the normal place  This is HKEY LOCAL MACHINE SOFTWARE Wow6432Node Classes CLSID  681EF637-F129-4AE9-94BB-618937E3F6B6  InprocServer32   If the DLL is built for 32 bits then you can use it directly on your 32-bit machine  If it s built for 64 bits then you ll have to contact the vendor and get a 32-bit version from them   When you have the DLL  register it by running c  windows system32 regsvr32 exe

User · Answer

WORKAROUND   The possible workaround is modify your project s platform from  Any CPU  to  X86   in Project s Properties  Build Platform s Target   ROOTCAUSE  The VSS Interop is a managed assembly using 32-bit Framework and the dll contains a 32-bit COM object  If you run this COM dll in 64 bit environment  you will get the error message

[.net] How to repair COMException error 80040154?

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