When I try to display a control with a material design color picker, i got an System.TypeLoadException.

The full description is : Could not load type ‘MaterialDesignColors.ColorManipulation.HsbConverter’ from assembly ‘MaterialDesignColors, Version=3.0.0.0, Culture=neutral, PublicKeyToken=df2a72020bd7962a’.

I’m working with Material Design Themes 4.9.0 and Material Design Color 3.0.0.0

I try to remove and reinstall the two packages.
I try to downgrade the version of theme and color.

As you can see the package is installed
(https://i.sstatic.net/TMh0gL8J.png)

Did someone got this error and fix it ?

Thanks for you time,

Quentin