E0713: A parameter is both a file and a folder
[id].vuka.html is the page at /pets/{id}, and a [id]/ folder beside it is that segment's folder, holding its layout, its pages and its endpoints: two places for one segment. A segment with a folder keeps its page in the folder, as its index. Reported at the file, naming the folder.
Wrong
text
pages/pets/
[id].vuka.html
[id]/edit.vuka.htmlRight
text
pages/pets/[id]/
index.vuka.html /pets/{id}
edit.vuka.html /pets/{id}/edit