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Why Am I Getting a 'Class Not Registered' (0x80040154) COM Exception?

Linda Hamilton
Linda HamiltonOriginal
2025-01-14 10:05:44527browse

Why Am I Getting a

Troubleshooting the "Class Not Registered" COM Exception (HRESULT 0x80040154)

Creating a COM class instance may result in this error:

<code>Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))</code>

This signifies that the required COM class isn't correctly registered on your system. Here's how to fix it:

  • Reinstall the COM Component: The most effective solution is usually to uninstall and then reinstall the COM component providing the class. Make sure the component registers itself during the installation.

If reinstalling doesn't work, try these additional steps:

  • Verify Assembly Architecture: Ensure all assemblies involved in creating the COM class are compiled for the same architecture (x86 or x64). If they aren't consistent, adjust your compilation target to x86. Inconsistencies in architecture are a common cause of this error.

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