Error 601 - Array to string conversion

Hi guys, I'm getting the following error when I try to access https://api.forecast.solar/estimate/-29.6/-52.1/25/0/1

{
    "result": null,
    "message": {
        "code": 601,
        "type": "error",
        "text": "Array to string conversion",
        "info": null,
        "ratelimit": {
            "period": 3600,
            "limit": 12,
            "remaining": 1
        }
    }
}