Prisma

My first push of a resolver function, and the server returns a 500

```{
  "data": {
    "assignmentLTILaunch": null
  },
  "errors": [
    {
      "message": "Whoops. Looks like an internal server error. Please contact us from the Console (<https://console.graph.cool>) or via email (support@graph.cool) and include your Request ID: us-west-2:simple:cj8vq4nh200000174arcy8jgg",
      "requestId": "us-west-2:simple:cj8vq4nh200000174arcy8jgg",
      "path": [
        "assignmentLTILaunch"
      ],
      "locations": [
        {
          "line": 2,
          "column": 2
        }
      ]
    }
  ]
}```

Here's the schema: ```type AssignmentLTILaunchPayload {
    ltiJWT: String
    ltiSessionIdJWT: String!
    clientRedirectUrl: String!
    serverRedirectUrl: String!
}

extend type Mutation {
    assignmentLTILaunch(assignmentId: String!, assignmentType: String!, requestBody: String!): AssignmentLTILaunchPayload
}
```

Mutliple redeploys, trying to make the function as simple as possible, always happens

```export default async (event: any) =&gt; {

}
```

I was thrown off by not having a descriptive error message

```export default async (event: any) =&gt; {
    return {
        ltiJWT: 'hello',
        ltiSessionIdJWT: 'hello',
        clientRedirectUrl: 'hello',
        serverRedirectUrl: 'hello'
    };
}
```