api add user error

api add user error

I use postman to call API but response error. 
parameter:
{
    "user": {
        "first_name": "Peter",
        "middle_name": "Rabbit",
        "last_name": "Atom",
        "name": "Peter Rabbit Atom",
        "is_vipuser": "false",
        "employee_id": "4229",
        "department": {
            "id": "5"
        },
        "mobile": "02892902",
        "description": "Help Desk manager",
        "sms_mail_id": "atom@sms.com",
        "jobtitle": "Java developer",
        "phone": "929992",
        "email_id": "peter@zoho.com",
        "secondary_emailids": [
            "peter@zohocorp.com",
            "rabbit@zohocorp.com",
            "atom@zoho.com"
        ],
        "cost_per_hour": "929",
        "service_request_approver": "true",
        "purchase_approver": "true",
        "purchase_approval_limit": "-1",
        "project_roles": {
            "id": "3"
        },
        "reporting_to": {
            "id": "4"
        },
        "requester_allowed_to_view": "0",
        "login_name": "peter",
        "password": "peter",
        "domain": {
            "id": "2"
        }
    }
}
response:
{
"response_status": {
"status_code": 4000,
"status": "failed",
"messages": [
{
"status_code": 4004,
"message": "Internal Error",
"type": "failed"
}
]
}
}



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