S3ImageAsset.Key provided incorrect OutputType: 'String'

[awalkerca]

I'm trying to get this plugin working against a private minio server. My server is on a local server, and is not setup with ssl (I know, I know..). So I made a small change:

export const createS3Instance = ({ accessKeyId, domain, secretAccessKey, protocol }) =>
  new S3({
    accessKeyId,
    apiVersion: '2006-03-01',
    endpoint: domain,
    s3ForcePathStyle: true,
    secretAccessKey,
    signatureVersion: 'v4',
    sslEnabled: protocol === 'https'
  })

It allows me to continue on, and I see the images downloading into the .caches folder correctly, but I seem to be getting issues with the node construction.

ERROR 

Missing onError handler for invocation 'building-schema', error was 'Error: S3ImageAsset.Key provided incorrect OutputType: 'String''. Stacktrace was 'Error:
S3ImageAsset.Key provided incorrect OutputType: 'String'