DuplicateChild

The children list passed to set_children contains the same child hotkey more than once. Deduplicate the children argument; current relations are visible in the ChildKeys storage for the parent hotkey and netuid.

Declared by the SubtensorModule pallet; it classifies to the semantic code invalid_argument.

Remediation

Check the argument values against the operation schema

The same explanation is available in the terminal: btcli explain DuplicateChild.