# OutputBufferTooSmall (/docs/errors/chain/OutputBufferTooSmall)

The output buffer the contract supplied to an API call is smaller than the data the runtime needs to write back. Check the output length pointer the contract passes and enlarge the buffer; usually a contract-side bug.

Declared by the `Contracts` 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 OutputBufferTooSmall`.