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 · Accepted 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

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

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

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

[.net] How to repair COMException error 80040154?

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