FirstEmissionBlockNumberAlreadySet

The object or state already exists; treat the goal as met or pick a different target

start_call was issued for a subnet whose emissions have already been started. Check the FirstEmissionBlockNumber storage for the netuid; a non-empty value means the subnet is already emitting and no action is needed.

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

Remediation

The object or state already exists; treat the goal as met or pick a different target

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