# CodeRejected (/docs/errors/chain/CodeRejected)

The uploaded WASM failed validation, most often because it imports a host API the node does not support, e.g. newer ink! against an older node. Rerun the node with `-lruntime::contracts=debug` to see the detailed rejection reason.

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 CodeRejected`.