Getting error trying to sign transaction 21BC

index.py

from two1.lib.wallet import Wallet, exceptions
from two1.lib.bitcoin.crypto import PublicKey
from two1.lib.bitcoin.script import Script
from two1.lib.bitcoin.txn import Transaction

SRV_ACCT = 'signing'

wallet = Wallet()

try:
    print("attempting to create account 'signing'")
    wallet.create_account(SRV_ACCT)
except exceptions.AccountCreationError:
    print("already have account signing created")
    pass

next_idx = 1
server_hd_pubkey = wallet.get_message_signing_public_key(SRV_ACCT, next_idx)

server_pubkey = server_hd_pubkey.compressed_bytes
owner_pubkey = PublicKey.from_bytes("040D3711FB353EDF77A13D1A3A33CFC7E04EEE626C9738EECC23754C06083DB8058C4F6DDFFE3445C1ADD3B1D121F70FE3B56EADD260AD43ED517C25B10FFBC3D0").compressed_bytes
other_pubkey = PublicKey.from_bytes("045AC8DD1042E3C7210324720F2520ED5B42CDBDC31610E3936E4925C67D37CDB3A0E1661B8BDAC2A090BD3425CDA715DFE131E591A27E7DF6A5CCC66383AE8E16").compressed_bytes

multi_script = Script.build_multisig_redeem(2, [owner_pubkey, server_pubkey, other_pubkey])
address = multi_script.address()

pbkey = wallet.get_payout_public_key(SRV_ACCT)
prkey = wallet.get_private_for_public(pbkey)

tx = wallet.send_to(address, 5000)
tx_object = tx[0]['txn']

idx = 0
for ip in tx_object.inputs:
  signed = tx_object.sign_input(idx, Transaction.SIG_HASH_ALL, prkey, multi_script)
  if not signed:
      print("Trouble signing input %d." % idx)
      abort(400)
  idx += 1

return true