VS2022 "Object reference not set to an instance of an object" with NuGet Package manager

Question

In my VS2022 getting "Object reference not set to an instance of an object" when attempting to install via NuGet Package manager a component. Specifically, "Gembox.Spreadsheet". Attached file shows the NuGet output details.

I can install "CommunityToolkit.MVVM" without issue.

I tried on another machine by temporarily installing VS2022 and creating very small project and it works.

I have tried Upgrading, uninstalling/Installing no difference. My main development machine is Windows 10 with all current updates. I tried a very small project but that fails.

The vendor of the components cannot reproduce the issue.

Answer 1

Hi @Herb Auld , 

Welcome to Microsoft Q&A! 

Would you like to do a clean reinstallation for Visual Studio and install the package “Gembox.Spreadsheet” again? 

1. Manually delete any leftover install and cache folder you previously installed to

C:\Program Files (x86)\Microsoft Visual Studio

%programdata%\Microsoft\visualstudio\packages

C:\Program Files\Microsoft Visual Studio

C:\Users\<UserName>\AppData\Local\Microsoft\VisualStudio 

2. Delete the setup registry key, which was set when you first installed (Maybe there is only one key, please check one by one.):

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\VisualStudio\Setup

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\Setup

HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\VisualStudio\Setup 

3. Download the new bootstrapper file from the page and reinstall the VS.

The attached file is not available, if you still have the error, you can share us more details. 

Sincerely,

Anna

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