Generation of a Viewpoint in Capella studio

Hello,
I’m still new to Capella and Capella Studio and trying to get used to it. I’m currently following the COST example tutorial available on this link
https://www.youtube.com/watch?v=oK2CkEtAaTM .
I have a problem with
the generation and run of the Viewpoint and can’t seem to understand where it comes from. When I run my Viewpoint, an
empty
Capella window opens instead of a window with the diagram. And this is the error message i get :
Best regards,
Islème

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