cant add product

[matthew42904]

trying to add product and i get this error:
pygrocy.errors.grocy_error.GrocyError: <Response [400]>

code:
`from pygrocy import Grocy

grocy = Grocy("http://xxx.xxx.xxx.xxx", "x8E9FEIxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx9afb1G4ufFa", port = 9192)

#for entry in grocy.stock():
#print("{} in stock for product id {}".format(entry.available_amount, entry.id))

tes = grocy.add_product_by_barcode('456789', 1, 0)
tes.id == 1
tes.name == 'test'`

im able to pull stock just cant add anything