Hello. I'm trying to retrieve the documents list and then get fillable fields information for each signed document. To do this, after retrieving documents list, I'm sending a GET request for each document to this url

'https://sign.zoho.com/api/v1/requests/' . $document['request_id'] . '/fielddata');

For some cases it actually returns the information, but for other cases it gives an error: URL_ROLLING_THROTTLES_LIMIT_EXCEEDED

For example, if I run this request for 10 documents, 1, 3, 7 might return the data, but the rest don't. On the second run it's different results.

What does this mean and how do i fix this?