# InvalidCallFlags (/docs/errors/chain/InvalidCallFlags)

The flags bitmask given to `seal_call` or `seal_delegate_call` contains an unknown or disallowed combination; delegate calls accept only a restricted flag set. Check the flags argument against the supported `CallFlags` bit values.

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 InvalidCallFlags`.