Google Plus One button backend error -32099

Question

I've added google plus one buttons on site.

Everything has been working fine for 3-4 months.

But now when i click a button it turns into an exclamation mark and i get the next json from google:

[
    {
        "error": 
        {
            "code": -32099,
            "message": "Backend Error",
            "data": 
            [
                {
                    "domain": "global",
                    "reason": "backendError",
                    "message": "Backend Error"
                }
            ]
        },
        "id": "pos.plusones.insert"
    }
]

Does anybody know the reason of such error?

P.S. I've also read this article. But i have working google plus one buttons on another site that is on the same hosting as the first.

Answer 1

This error indicates that the data-href you are passing to the +1 button returned an HTTP 500 error when Google tried to fetch the page.

For example, I tried the +1 button which references http://qbash.ru/Quotations/Details/339, but fetching that URL returns:

Извините, во время обработки Вашего запроса произошла ошибка.

With the headers:

Request URL:http://qbash.ru/Quotations/Details/339
Request Method:GET
Status Code:500 Internal Server Error