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Title
Error 1935 Occurs at Runtime

Summary

This error indicates a generic failure returned from Fusion while attempting to install a .NET assembly in to the Global Assembly Cache or the Win32 GAC (WinSxS).

Symptoms

At runtime, you see the following error:

  • Error 1935. An error occurred during the installation of assembly component {COMPONENT_GUID}. HRESULT: ERROR_CODE
Where COMPONENT_GUID is the guid of a component in your MSI package that contains a .NET assembly and ERROR_CODE is the HRESULT passed back. Often times these messages contain information relating to your .NET assembly that includes Publick Key Tokens, Processor Architecture, etc.

Cause

This error indicates a generic failure returned from Fusion while attempting to install a .NET assembly in to the Global Assembly Cache or the Win32 GAC (WinSxS).

Workaround

Because the error is generic and only indicates that something failed, there are extra steps that will have to be taken in order to debug this problem. Before you begin to heavily debug this issue, it's first important to ensure that the .NET properties being used to install your assembly (such as ProcessorArchitecture, PublicKeyToken, Version) are what the .NET assembly requires. If this is not the case, then changing them to be the appropriate value from your build environment should resolve those types of issues.
The first step is to decode the HRESULT code that was returned through the error message. This will indicate the type of failure and possibly suggest the reason why it failed.
The second step is to determine the component that caused the error. This will allow you to pinpoint whether it is a component you are installing or a merge module (such as the Microsoft Visual C++ Runtimes) that is causing this error.
After doing those two steps, following the directions indicated by Aaron Stebner in his blog should point you in the right direction:

Additional Information

You can read more of Aaron Stebner's various bloggings here:
Aaron Stebner's WebLog
For more information on decoding HRESULT codes, please reference this article:
Aaron Stebner also has a unified .NET Troubleshooting guide here:
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Error 1935 Occurs at Runtime