Add Task General Error 6500

Add Task General Error 6500


I'm trying to create a task following the guidelines on the API spec, but I can't get it to work. I tried several methidsbut I'm not getting significant enough infomation to figure out what's going on.

I tried POSTing the required fields (with and without &flag=internal attached) to:

    "person_responsible": xxxx,
    "tasklist_id": xxxxxxxxxxxxxxxxxxxx,
    "name": "Test task",
    "start_date": "11-13-2018",
    "end_date": "11-14-2018",
    "duration": 1,
    "duration_type": "days",
    "priority": "Medium",
    "description": "test description",
    "uploaddoc": "",
    "start_time": "13:00",
    "end_time": "13:00",
    "owner_work": [],
    "work_type": "work_in_percentage",
    "custom_fields": {},
    "completed_on": "",
    "reminder": "",
    "json_string": {}

Which yields...
    "error": {
        "code": 6831,
        "message": "Input Parameter Missing"

As far as I can tell, all required parameters are there. 
    "error": {
        "code": 6832,
        "message": "Input Parameter Does not Match the Pattern Specified"

    "error": {
        "code": 6500,
        "message": "General Error"

Are all fields required?
Which fields are optional and what do they default to?
Which is the preferred method: query string or payload?
Which HTTP method is the correct one?
Do you have a working sample URL/payload which I can work off of?

As far as I can tell the API spec doesn't answer this. Any help would be appreciated, thank you.

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