Class not registered Error

Question

Running an application from Visual Studio 2012 on 64-bit computers  displays the following error message       Retrieving the COM class factory for component with CLSID  F2D4F4E5-EEA1-46FF-A83B-A270C92DAE4B  failed due to the following error  80040154 Class not registered  Exception from HRESULT  0x80040154  REGDB E CLASSNOTREG     I am using Inventor packandgo dll library in visualstudio   Anyone know what is the error

User · Accepted Answer

My problem and the solution

I have a 32 bit third party dll which I have installed in 2008 R2 machine which is 64 bit.
I have a wcf service created in .net 4.5 framework which calls the 32 bit third party dll for process. Now I have build property set to target 'any' cpu and deployed it to the 64 bit machine.
When Ii tried to invoke the wcf service got error "80040154 Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG"
Now Ii used ProcMon.exe to trace the com registry issue and identified that the process is looking for the registry entry at HKLM\CLSID and HKCR\CLSID where there is no entry.
Came to know that Microsoft will not register the 32 bit com components to the paths HKLM\CLSID, HKCR\CLSID in 64 bit machine rather it places the entry in HKLM\Wow6432Node\CLSID and HKCR\Wow6432Node\CLSID paths.
Now the conflict is 64 bit process trying to invoke 32 bit process in 64 bit machine which will look for the registry entry in HKLM\CLSID, HKCR\CLSID. The solution is we have to force the 64 bit process to look at the registry entry at HKLM\Wow6432Node\CLSID and HKCR\Wow6432Node\CLSID.
This can be achieved by configuring the wcf service project properties to target to 'X86' machine instead of 'Any'.
After deploying the 'X86' version to the 2008 R2 server got the issue "System.BadImageFormatException: Could not load file or assembly"
Solution to this badimageformatexception is setting the 'Enable32bitApplications' to 'True' in IIS Apppool properties for the right apppool.

User · Answer

In 64 bit windows machines the COM components need to register itself in HKEY CLASSES ROOT CLSID  64 bit component  OR HKEY CLASSES ROOT Wow6432Node CLSID  32 bit component    If your application is a 32 bit application running on 64-bit machine the COM library would typically look for the GUID under Wow64 node and if your application is a 64 bit application  the COM library would try to load from HKEY CLASSES ROOT CLSID  Make sure you are  targeting the correct platform and ensure you have installed the correct version of library 32 64 bit

User · Answer

I was getting the below error in my 32 bit application       Error  Retrieving the COM class factory for component with CLSID    4911BB26-11EE-4182-B66C-64DF2FA6502D  failed due to the following   error  80040154 Class not registered  Exception from HRESULT    0x80040154  REGDB E CLASSNOTREG      And on setting the  Enable32bitApplications  to true in defaultapplicationpool in IIS worked for me

User · Answer

For me  I had to install Microsoft Access Database Engine 2010 Redistributable and restart my computer

User · Answer

Somewhere in the code you are using  there is a call to the Win32 API  CoCreateInstance  to dynamically load a DLL and instantiate an object from it   The mapping between the component ID and the DLL that is capable of instantiating that object is usually found in HEKY CLASSES ROOT CLSID in the registry   To discuss this further would be to explain a lot about COM in Windows   But the error indicates that the COM guid is not present in the registry   I don t much about what the PackAndGo DLL is  an Autodesk component   but I suspect you simply need to  install  that component or the software package it came with through the designated installer to have that DLL and appropriate COM registry keys on your computer you are trying to run your code on   i e  go run setup exe for this product    In other words  I think you need to install  Pack and Go  on this computer instead of just copying the DLL to the target machine   Also  make sure you decide to build your code appropriate as 32-bit vs  64-bit depending on the which build flavor  32 or 64 bit  of Pack And Go you install

User · Answer

I had the same problem  I tried lot of ways but at last solution was simple  Solution   Open IIS  In Application Pools  right click on the  net framework that is being used  Go to settings and change  Enable 32-Bit Applications  to  True

User · Answer

I had run into the same problem  I added reference of Microsoft Office Interop Excel COM component s dll but Office was not installed on my system it wont give compile time error  I moved my application to another system and ran it  it worked successfully   So  I can say in my case it was the system environment which was causing this issue

User · Answer

The problem is that the DLL is registered on the 32 bit version of the windows registry  and the application is using the 64 bit version      Solution  Go into the Project Properties  Compile tab and click  Advanced Compile Options      Change  Target CPU  to x86  click OK  save and try again    Source  http   www theogray com blog 2009 10 comexception-regdbeclassnotreg-on-64-bit-windows  Has worked for me with an VB 6 COM DLL invoked from a  Net 4 Winforms application

User · Answer

I had this problem and I solved it when I understood that it was looking for the Windows Registry specified in the brackets   Since the error was happening only in one computer  what I had to do was export the registry from the computer that it was working and install it on the computer that was missing it

User · Answer

Long solved I m sure but this might help some other poor soul   This error can ocurre if the DLL you are deploying in the install package is not the same as the DLL you are referencing  these will have different IDs   Sounds obvious but can easily happen if you make a small change to the dll and have previously installed the app on your own machine which reregisters the dll

[dll] Class not registered Error

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