Creating new task API giving input parameter missing

I am using ZOHO Portal API to create new Task. The documentation says only Name is required. However i have tried to send everything via APi but still i am getting input parameter missing.

Here are the fields I am sending via POST along with the url

{

"fields": {

"name": "a",

"person_responsible": 723522223,

"tasklist_id": "1476105000001984003",

"end_date": "11-13-20",

"start_date": "11-06-20",

"start_time": "01:00 pm",

"end_time": "03:00 pm",

"duration": 10,

"duration_type": "days",

"priority": "Low",

"description": "b",

"work_type": "work_hrs_per_day",

"rate_her_hour": 10,

"owner_work": "{\"user_id\":723522223,\"working_hours\":2}"

"url": "https://projectsapi.zoho.com/restapi/portal/xxxxxx/projects/xxxxxxx/tasks/",

"response": "{\"error\":{\"code\":6831,\"message\":\"Input Parameter Missing\"}}\n"

}

What am I missing?

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