Windows Forms Designer error : Value cannot be null. Parameter name: instance

Question

I am developing an app using C# Windows Forms with framework DevExpress.

My IDE are Visual Studio Community 2022.

It is all okay.
But after I am updating to Version 17.6.0 the window that I develop cannot load design mode with error message "Value cannot be null. Parameter name: instance"

I have check my nuget but all is updated and no problem.
I have check the form designer file and has no clue..

Answer 1

Hi @Ahmad Ganteng ,

Welcome to Microsoft Q&A forum.

Please try following methods and let us know if any of them works.

1. Close VS => remove the hidden .vs folder in your solution folder => Open VS and open your solution => right-click your project => Unload Project => right-click it again => Reload Project => check if the Designer works.
2. Try to clean your project(remove the bin, obj folders) and rebuild it.
3. Go to C:\Users\username\AppData\Local\Microsoft\VisualStudio\17.0_XXXXXXXX folder find and rename ComponentModelCache folder.
4. Try to repair VS => from VS Installer > More > Repair.
5. Try to reinstall extensions(Extensions > Manage Extensions) and reset VS settings(run devenv /ResetSettings in Developer Command Prompt for Visual Studio 2022 Community) if possible.

Please also try to create a new Windows Forms project and let us know if this error also appears in a newly created project.

Looking forward to hearing from you.

Sincerely,

Tianyu

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Answer 2

There are some reported issues with 17.6.0 edition and your current issue may be part of this.

What in 17.6.0 do you need? I ask because there is nothing ground-breaking in this edition.