Custom package can not be installed

Hi everyone,

I created a new customized package with Microsoft visual studio on C# language and then I created the NuGet file as the following link https://docs.uipath.com/activities/docs/creating-a-custom-activity.

Before I had any problem to edit, install and use this package.
However, after to update this activity I can’t install it and so can’t use it (as you can see on the below screenshot).
Do you know, by any chance, a solution to resolve this problem, or an assumption of the problem’s cause?

Thanks a lot