Errors/Chain errors
EmissionWeightIndexDuplicated
Check the argument values against the operation schema
sudo_set_subnet_emission_weights listed the same slot index twice in uids. Give each slot at most once per call.
Declared by the SubtensorModule pallet; it classifies to the semantic code invalid_argument.
Declared at pallets/subtensor/src/macros/errors.rs#L426.
Remediation
Check the argument values against the operation schema
The same explanation is available in the terminal: btcli explain EmissionWeightIndexDuplicated.