# NonDefaultComposite (/docs/errors/chain/NonDefaultComposite)

The account cannot be killed because its composite account data is not in the default state. Check the account's `System.Account` entry; all balance and data fields must be default before the account can be removed this way.

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

## Remediation [#remediation]

Check the argument values against the operation schema

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