Having problems with "ton" library in python

Question

I'm using ton library and Python. This is the code I'm trying to run:

from ton.sync import TonlibClient
client = TonlibClient()
TonlibClient.enable_unaudited_binaries()
client.init_tonlib()
seed = "24 security phrases"
wallet = client.import_wallet(seed)
balance = client.from_nano(wallet.get_balance())
print(balance)

This is the error I'm getting:

Traceback (most recent call last):
  File "test", line 13, in <module>
    print(wallet.get_balance())
  File     result = await self._execute(query, timeout=timeout)
ton.tonlibjson.TonlibError: LITE_SERVER_UNKNOWN: timeout(during last block synchronization)

This code worked fine before, but after a few days it started giving this error. I'm running this on a DigitalOcean server so my internet isn't a problem. I've rebooted the server, reinstalled the library, changed server, but nothing works.