Unless you changed the collection to a non-system collection, the error is correct.
INOXDE7936 - Invalid define of system collection.
Explanation
The schema to be defined refers to a collection reserved for system usage.
Action
Choose a different collection name.
Validate or Define, same difference. I changed the collection to MYcollection (from ino:collection), click ok on the missing Doctype (screen) and the schem validated.

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