AppSync Start Schema Creation Failed with response details: The schema is being processed

Hi, I am trying your example to connect to my PostgreSQL which hosted on docker. However I encounter below error when I was trying to run the `provider` lambda function. At below pieces of code:

```
await appsyncClient.startSchemaCreation({ apiId, definition }).promise()
let response = await appsyncClient.getSchemaCreationStatus({ apiId }).promise()
while (response.status !== 'SUCCESS') {
console.log(`Schema Creation Status: ${response.status}`)

if (response.status === 'FAILED') {
console.log(`Schema creation failed: ${response.details}`)
}

await new Promise((r) => setTimeout(r, 250))
response.status = (await appsyncClient.getSchemaCreationStatus({ apiId }).promise()).status
}
```

It returns status FAILED with response of: `The schema is being processed`.
May I know how to resolve this?

Thank you so much for this repo!