fromDate cannot be greater than toDate.

The Synup API returns SY60101 in the errors array when this happens.

What the response looks like

{
  "data": null,
  "errors": [
    {
      "message": "fromDate cannot be greater than toDate.",
      "context": {},
      "code": "SY60101"
    }
  ]
}

Where it comes from

Documented under Profile Analytics. The context field carries the offending value when one is relevant, and is empty otherwise.

See the full error code reference for every code the API can return.

Other Profile Analytics errors