@wallace hey Idk if you've figured it out but the issue was in the schema.graphql file. The documentation says
' put all shop schemas #import /shop//.graphql after #import /promotion/*.graphql this line.'
This is what caused the error. The shop schemas are already imported on the top and then when we do at the bottom, it says that its duplicating. Just remove that line and it works like charm.
Hope this helps 🙂