Failed to load schema, no error output

### Describe the bug

I had a schema from AppSync which includes an AWSJSON scalar type. If I don't define that type, graphql-codegen fails with absolutely no indication of why, just that it "Failed to load schema"

### Your Example Website or App

https://codesandbox.io/s/inspiring-panna-ixxqrr?file=/schema.graphql

### Steps to Reproduce the Bug or Issue

1. Open the codesandbox link.
2. Run `yarn generate`
3. Notice the output:

### Expected behavior

Some sort of error indicating an unresolved type of `AWSJSON`. If I change that prop in the schema to be a `String`, everything works just fine.

### Screenshots or Videos

_No response_

### Platform

- OS: macOS
- NodeJS: 16.16.0
- `graphql` version: 16.5.0
- `@graphql-codegen/*` version(s): [e.g. 2.6.2]
"@graphql-codegen/cli": "^2.9.1",
"@graphql-codegen/typed-document-node": "^2.3.2",
"@graphql-codegen/typescript-operations": "^2.5.2",

### Codegen Config File

overwrite: true
schema:
- src/generated/foo.graphql
documents: null
generates:
src/generated/graphql.ts:
plugins:
- typescript
- typescript-operations
- typed-document-node
config:
preResolveTypes: true

### Additional context

_No response_