Help! Installed custom activities are not found in UiPath's activities card

Excuse me!
I customized a program with the WPF User Control Library (.NET Framework) and the Windows Forms Control Library (.NET Framework) in C# and successfully installed it in the management package in UiPath Studio. On the interface, the dependency package in the project card can see it, but it can’t be found in the active card.
However, I followed the example on the UiPath website, which is to use the class library (.NET Framework) in C#, which can be found in the activity card.
Why is this? How can I handle it?

Hello @Sun_Huang

Make sure you have the minimum required. Net framework installed in your machine. The requirement is shown in the dependencies if you click on each one of those activity packages.

Let me know if this works

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Hello @Sun_Huang
Namespace must be same for all class file

How to create multiple activities using Visual Studio?
Go through it.iy will help you

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Thank you for your help, I probably found the way to achieve it.

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Hello
Thank you for your help!

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