Object reference not set to an instance of an object

Hi everyone, I was working fine with Aveva SP2023 R2 +AOT 2023 R2 + Visual Studio 2022.
I have install Aveva 2023 R2 SP1 on it, in order to upgrade the soft. Aveva SP SP1 works fine.

I can create Aveva project and build project under Visual Studio 2022.
Therefore, I can't open View Editor in order to add any toolbox.

I get a yellow ribbon error : "Object reference not set to an instance of an object"

Have you any solution in order to get View Editor works without errors message and be able to create WPF with AVEVA object toolkit ?

Regards,