AlreadyDeposited

The account calling safe-mode enter or extend already has a safe-mode deposit on hold, so another cannot be placed. Check the account's Deposits entries and its balance held under the EnterOrExtend hold reason.

Declared by the SafeMode 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 AlreadyDeposited.