Hello there.
I was learning to use the UI Toolkit to create some Editor and Property Drawers.
At some point I created a USS file from the UI Toolkit window.
But changed my mind and deleted that file.
Now, the UXML in which I pressed “create USS file” cannot be edited anymore and return this error on trying to open it :
UI Builder Failed to open Assets/UXML/SerializableGauge_VisualTree.uxml asset. This may be due to invalid UXML syntax or UXML syntax the UI Builder does not yet support. Check console for details.
Additional precision : the Visual Tree is still displayed correctly on my component