ETL JSON Example Error

I’m trying to run the ETL JSON example from the Orient documentation. I’m getting this error:

OrientDB etl v.3.0.24 - Veloce (build 9920dff342aee1351c89e749d3f0a94ce466355b, branch 3.0.x) https://www.orientdb.com
2020-05-07 15:00:48:048 INFO Default limit of open files (512) will be used. [ONative]
2020-05-07 15:00:48:116 INFO BEGIN ETL PROCESSOR [OETLProcessor]
2020-05-07 15:00:48:127 INFO [file] Reading from file /Users/xxx/Development/padsi/osmCrossLoader/test/test.json with encoding UTF-8 [OETLFileSource]
2020-05-07 15:00:48:128 INFO Started execution with 1 worker threads [OETLProcessor]
2020-05-07 15:00:48:133 SEVER ETL process has problem: [OETLProcessor]
2020-05-07 15:00:48:134 INFO END ETL PROCESSOR [OETLProcessor]
2020-05-07 15:00:48:135 INFO + extracted 0 entries (0 entries/sec) - 0 entries -> loaded 0 bytes (0 bytes/sec) Total time: 17ms [0 warnings, 0 errors] [OETLProcessor] %

In the effort to simplify I removed the loader options so my file looks like this:

{
  "config": {
    "log": "debug"
  },
  "source" : {
    "file": { "path": "/Users/xxx/Development/padsi/osmCrossLoader/test/test.json" }
  },
  "extractor" : {
    "json": {},
    "log": {}

  },
  "transformers" : [
    { "merge": { "joinFieldName": "id", "lookup": "Account.id" } },
    { "vertex": { "class": "Account"} },
    { "edge": {
      "class": "Friend",
      "joinFieldName": "friends",
      "lookup": "Account.id",
      "unresolvedLinkAction": "CREATE"
    } },
    { "edge": {
      "class": "Enemy",
      "joinFieldName": "enemies",
      "lookup": "Account.id",
      "unresolvedLinkAction": "CREATE"
    } },
  ],
  "loader" : {
    "output": {
    }
  }
}

Is there a way to get ETL to give more information about what’s wrong?