# GrandpaChangeDelayMustBeZero (/docs/errors/chain/GrandpaChangeDelayMustBeZero)

`schedule_grandpa_change` was given a nonzero `in_blocks` delay. GRANDPA authority changes submitted through AdminUtils must activate at the end of the current block so the authority set and its set ID remain consistent. Pass `in_blocks=0`.

Declared by the `AdminUtils` pallet; it classifies to the semantic code [`invalid_argument`](/docs/errors/invalid-argument).

Declared at [`pallets/admin-utils/src/lib.rs#L182`](/code/pallets/admin-utils/src/lib.rs#L182).

## Remediation [#remediation]

Check the argument values against the operation schema

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