create_master_account("master") fails

[pkazimirenka]

When I try to create master account, get following error:

create_master_account("master")
######### Create a master account object master.
Importing keys of the account eosio into the wallet _127_0_0_1_8888_default
Traceback (most recent call last):
File "", line 1, in
File "/Users/user/Work/Projects/eos/src/eosfactory/eosfactory/shell/account.py", line 424, in create_master_account
account_object_name, account_object, logger)
File "/Users/user/Work/Projects/eos/src/eosfactory/eosfactory/shell/account.py", line 127, in put_account_to_wallet_and_on_stack
if wallet_singleton.import_key(account_object):
File "/Users/user/Work/Projects/eos/src/eosfactory/eosfactory/shell/wallet.py", line 280, in import_key
account_name if account_name else "n/a", self.name,key))
eosfactory.core.errors.Error: ERROR:
Failed to import keys of the account 'eosio' into the wallet '_127_0_0_1_8888_default'