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---
title: Invalid Argument Type Error
---
# Invalid Argument Type Error
## Description
This error is thrown when an argument is of the wrong type, it usually happens
when passing **unions** or **interfaces** as an argument, for example the
following code will throw this error:
```python
import strawberry
from typing import Union, Annotated
@strawberry.type
class TypeA:
id: strawberry.ID
ExampleUnion = Annotated[Union[TypeA], strawberry.union("ExampleUnion")]
@strawberry.type
class Query:
@strawberry.field
def example(self, data: Example) -> str:
return "this is an example"
schema = strawberry.Schema(query=Query)
```
## Using union types as arguments
The latest [GraphQL specification](https://spec.graphql.org/October2021/)
doesn't allow using unions as arguments. There's currently an
[RFC for adding a `oneOf` directive](https://github.com/graphql/graphql-spec/pull/825)
that might work for your use case, but it's not yet implemented in the spec and
Strawberry
|
