# RecycleEmissionMustBeZero (/docs/errors/chain/RecycleEmissionMustBeZero)

Slot 1 (recycle) of the emission weight vector was set to a non-zero share. Recycling alpha emission is reserved for a future runtime; in v1 the recycle share must be 0 (or simply omitted).

Declared by the `SubtensorModule` pallet; it classifies to the semantic code [`policy_violation`](/docs/errors/policy-violation).

Declared at [`pallets/subtensor/src/macros/errors.rs#L434`](/code/pallets/subtensor/src/macros/errors.rs#L434).

## Remediation [#remediation]

The action exceeds a configured safety policy

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