Selling Error

[breezer89]

Hi,
when I try to sell some newly-bought items which were sent to the tradepile already,
I get the following error:

items=session.tradepile()
for item in items:
session.sell(item['id'], 600, 650)

Traceback (most recent call last):
File "<pyshell#4>", line 2, in
session.sell(item['id'], 600, 650)
File "C:\Users\HP\Desktop\FUT Autobidder\fut-master\fut\core.py", line 1320, in sell
rc = self.request(method, url, data=json.dumps(data), params={'sku_b': self.sku_b})
File "C:\Users\HP\Desktop\FUT Autobidder\fut-master\fut\core.py", line 791, in request
raise Conflict()
fut.exceptions.Conflict

Can anybody help me please?

[breezer89]

what I don't understand is that the exact same code works completely fine for items which were already offered on the transfer market...