When I use the following code to complete the transfer

from beem.account import Account
from beem import Steem
active_wif = "5xxxx"
stm = Steem(keys=[active_wif])
acc = Account("test", steem_instance=stm)
acc.transfer("test1", 1, "HIVE", "test")

there are always errors：

beemapi.exceptions.MissingRequiredActiveAuthority

My Python version is 2.7
I'm sure my active-key is correct