# EpochTriggerAlreadyPending (/docs/errors/chain/EpochTriggerAlreadyPending)

`trigger_epoch` was called while a previously triggered epoch is still queued for this subnet. Check the `PendingEpochAt` storage for the netuid and wait for the pending epoch to fire before triggering again.

Declared by the `SubtensorModule` pallet; it classifies to the semantic code [`already_exists`](/docs/errors/already-exists).

## Remediation [#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 EpochTriggerAlreadyPending`.