> ## Documentation Index
> Fetch the complete documentation index at: https://developers.stellar.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Allow Trust Result Codes

> These are result codes that communicate success (200) or failure (400) specific to the Allow Trust operation.

These are result codes that communicate success (200) or failure (400) specific to the `Allow Trust` operation.

Learn more about the [`Allow Trust` operation](../../../../../../../learn/fundamentals/transactions/list-of-operations#allow-trust).

**OpSuccess** `ALLOW_TRUST_SUCCESS`

Trust trust operation was successful.

**OpMalformed** `ALLOW_TRUST_MALFORMED`

The asset specified in type is invalid. In addition, this error happens when the native asset is specified.

**op\_no\_trustline** `ALLOW_TRUST_NO_TRUST_LINE`

The trustor does not have a trustline with the issuer performing this operation.

**op\_not\_required** `ALLOW_TRUST_TRUST_NOT_REQUIRED`

The source account (issuer performing this operation) does not require trust. In other words, it does not have to have the flag AUTH\_REQUIRED\_FLAG set.

**op\_cant\_revoke** `ALLOW_TRUST_CANT_REVOKE`

The source account is trying to revoke the trustline of the trustor, but it cannot do so.

**op\_self\_not\_allowed** `ALLOW_TRUST_SELF_NOT_ALLOWED`

The source account attempted to allow a trustline for itself, which is not allowed because an account cannot create a trustline with itself.

**op\_low\_reserve** `ALLOW_TRUST_LOW_RESERVE`

Claimable balances can't be created on revoke due to low reserves