Hi Quentin Goulas,
Comme je ne suis pas natif français, je réponds à la question en anglais. Désolé pour le dérangement
As per my understanding you are trying to create an icon for a subsystem in your Simulink model.
The error "unable to find part 'simulink/maskimages/subsystemname.svg' : Could not successfully parse URI string" indicates that there was an issue parsing or interpreting the provided URI string. This could be due to various reasons such as an incorrect path, a missing resource, or a syntax error within the URI string that is the path to image in your case.
To resolve the error, make sure to provide a valid path to the image and check if the image is present in the correct folder.
Hope this resolves you query!!
