i am getting same error tryed two different virtual server

Traceback (most recent call last):
  File "/home/krash/lattack/lattice_attack.py", line 259, in <module>
    lattice_attack_cli(arg.f, arg.l)
  File "/home/krash/lattack/lattice_attack.py", line 239, in lattice_attack_cli
    result = recover_private_key(
  File "/home/krash/lattack/lattice_attack.py", line 195, in recover_private_key
    res = test_result(lattice, pub_key, curve)
  File "/home/krash/lattack/lattice_attack.py", line 93, in test_result
    if target_pubkey == ecdsa_lib.privkey_to_pubkey(cand1, curve):
  File "/home/krash/lattack/ecdsa_lib.py", line 129, in privkey_to_pubkey
    ec.derive_private_key(pv_key_int, ec_backend, backends.default_backend())
  File "/usr/lib/python3/dist-packages/cryptography/hazmat/primitives/asymmetric/ec.py", line 332, in derive_private_key
    raise TypeError("private_value must be an integer type.")
TypeError: private_value must be an integer type.

how to run server mode?

pc 1 ip 35.221.30.146
from pc1 i run ./kangaroo -w save.work -wi 300 -o result.txt -s -d 36 in.txt


and pc2:
Kangaroo.exe -w kang.work -wi 300 -c 35.221.30.146
Kangaroo v2.2
Number of CPU thread: 4
Cannot connect to server: 35.221.30.146
Cannot connect to host: Connection timed out