```js
export const PERSON_CREATE_MUTATION = gql`
mutation PersonCreateMutation(
$pogyowonAlias: String
\!h $createdWhen: String!
\!h $name: String!
){
createPerson(
pogyowonInfo: {alias: $pogyowonAlias }
createdWhen: $createdWhen
name: $name
){
id
}
}
`
```
here if I miss '!'(which is differnt from server) then it makes error.
this is stupid coz the errors are unclear. they don't show what is the issue but only throwing 400 error