[Python] Why do I keep getting the error of "Item 'Feed' cannot be parsed" when trying to...

I am using the sp-api python extension to import a test product through the JSON_LISTINGS_FEED and everything goes through into amazon ok, but once the feed is processed and I download the amazon document it says "Item 'Feed' cannot be parsed".

I cannot figure out what is wrong as I am almost 100% positive everything I have is formatted correctly and i have compared my product json to the amazon json schema and everything is correct. Please let me know if there is any way you could help

here is my python code:

import requests
import json, xml
import simplejson
import time
import os
from bs4 import BeautifulSoup
from datetime import datetime, timedelta
from io import BytesIO
import sys
import xml.etree.ElementTree as ET
from sp_api.base import Marketplaces
from sp_api.api import Orders
from sp_api.api import Feeds


url = "https://api.amazon.com/auth/o2/token"
r = requests.post(url, data = {"grant_type": "refresh_token", "refresh_token": xxxxx)
print(r.status_code)

atoken = r.json()['access_token']
rtoken = r.json()['refresh_token']

credentials = dict(
refresh_token = rtoken,
lwa_app_id='xxxxx',
lwa_client_secret='xxxxx',
)

feed = BytesIO()
file = str.encode("amazonjson.json")
feed.write(file)
feed.seek(0)

print(feed)
response = Feeds(credentials = credentials, marketplace = Marketplaces.US).submit_feed("JSON_LISTINGS_FEED", file = feed, content_type="application/json; charset=utf-8")
print(response)


here is my json format:

{
"header": {
"sellerId": "XXXXXXXXXXX",
"version": "2.0",
"issueLocale": "en_US"
},
"messages": [
{
"messageId": 1,
"sku": "284.050.01",
"operationType": "UPDATE",
"productType": "LUGGAGE",
"requirements": "LISTING",
"attributes": {
"item_name": [
{
"value": "TEST Title",
"language_tag": "en_US",
"marketplace_id": "ATVPDKIKX0DER"
}
],
"fulfillment_availability": [
{
"fulfillment_channel_code": "AMAZON_NA",
"quantity": 10
}
],
"purchasable_offer": [
{
"currency": "US",
"our_price": [
{
"schedule": [
{
"value_with_tax": 285.93
}
]
}
],
"marketplace_id": "ATVPDKIKX0DER"
}
]
}
}
]


}

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