Я получаю предупреждение EXTJS, что данные JSON неверны

Question

Мои данные выглядят так.

{
  "total": "5",
  "data": [
    {
      "Id": "5141",
      "Qty": "1",
      "Year": "175",
      "Country": "GREAT BRITAN",
      "Denomination": "HALF PENNY",
      "Grade": "Uncirculated",
      "Mint": "",
      "Value": "5.00",
      "Obversa": "",
      "Reverse": "",
      "Comments": "",
      "PurchaseDate": "2010-11-05 00:00:00",
      "CoinTotal": "5.00"
    },
    {
      "Id": "5141",
      "Qty": "1",
      "Year": "175",
      "Country": "GREAT BRITAN",
      "Denomination": "HALF PENNY",
      "Grade": "Fair",
      "Mint": "",
      "Value": "5.00",
      "Obversa": "",
      "Reverse": "",
      "Comments": "",
      "PurchaseDate": "2010-11-05 00:00:00",
      "CoinTotal": "5.00"
    },
    {
      "Id": "5141",
      "Qty": "1",
      "Year": "175",
      "Country": "GREAT BRITAN",
      "Denomination": "HALF PENNY",
      "Grade": "Very Fine",
      "Mint": "",
      "Value": "5.00",
      "Obversa": "",
      "Reverse": "",
      "Comments": "",
      "PurchaseDate": "2010-11-05 00:00:00",
      "CoinTotal": "5.00"
    },
    {
      "Id": "5141",
      "Qty": "1",
      "Year": "175",
      "Country": "GREAT BRITAN",
      "Denomination": "HALF PENNY",
      "Grade": "PROOF",
      "Mint": "",
      "Value": "5.00",
      "Obversa": "",
      "Reverse": "",
      "Comments": "",
      "PurchaseDate": "2010-11-05 00:00:00",
      "CoinTotal": "5.00"
    },
    {
      "Id": "5141",
      "Qty": "1",
      "Year": "175",
      "Country": "GREAT BRITAN",
      "Denomination": "HALF PENNY",
      "Grade": "Good",
      "Mint": "",
      "Value": "5.00",
      "Obversa": "",
      "Reverse": "",
      "Comments": "",
      "PurchaseDate": "2010-11-05 00:00:00",
      "CoinTotal": "5.00"
    }
  ]
}

Однако я все еще получаю эту ошибку

[WARN] Невозможно проанализировать JSON, возвращенный сервером.

Может кто-нибудь определить ошибку и исправить?