Get change list using API v3 (SDP MSP Version: 9.4 Build 9424)

Hi, how i get all the change on API v3 here is my sample get url: https://XXXX/api/v3/changes?TECHNICIAN_KEY=XXX&input_data={

"list_info":{

"row_count":200,

"start_index":1,

"get_total_count":true

}

}&format=json

RESPONSE:
{
    "response_status": {
        "status": "failed",
        "messages": [
            {
                "status_code": "500",
                "message": "Error when performing required operation.",
                "type": "failed"
            }
        ]
    },
    "list_info": {
        "end_index": "10",
        "start_index": "1",
        "get_total_count": "true",
        "page_number": "1",
        "sort_order": "A",
        "row_count": "200",
        "sort_field": "",
        "total_count": "0",
        "search_fields": ""
    }
}

UPDATE:
when i try to get specific change its working, but getting all the change list i have the error above not sure where is the problem. Here is the url i
url i used to get specific change https://xxxxx/api/v3/changes/5537?TECHNICIAN_KEY=XXXXXX