jigu.error.LcdInternalError: (500) invalid request: must contain at least one message: failed to simulate tx

[hanlsin]

• Jigu version: 0.1.4
• Python version: 3.7
• Operating System: Mac OS X

Description

_api_post("/txs/estimate_fee") returns the title error.

What I Did

terra = Terra("tequila-0004", "https://tequila-lcd.terra.dev")
...
send = MsgSend(from_address=wallet.address, to_address=to, amount=[Coin("uluna", 3000)])
# no error
fee = StdFee.make(gas=200_000, uluna=1_000_000)
tx = wallet.create_and_sign_tx(send, fee=fee)
# error
tx2 = wallet.create_and_sign_tx(send)

This is the stack trace:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/yp/bin/miniconda3/envs/bcbank/lib/python3.7/site-packages/jigu/client/object_query/wallet.py", line 75, in create_and_sign_tx
    return self.sign_tx(self.create_tx(*msgs, fee=fee, memo=memo))
  File "/Users/yp/bin/miniconda3/envs/bcbank/lib/python3.7/site-packages/jigu/client/object_query/wallet.py", line 50, in create_tx
    fee = self.terra.tx.estimate_fee(tx)
  File "/Users/yp/bin/miniconda3/envs/bcbank/lib/python3.7/site-packages/jigu/client/lcd/api/tx.py", line 79, in estimate_fee
    res = self._api_post("/txs/estimate_fee", data=data)
  File "/Users/yp/bin/miniconda3/envs/bcbank/lib/python3.7/site-packages/jigu/client/lcd/api/__init__.py", line 79, in _api_post
    return self._handle_response(self.terra.lcd.post(path, **kwargs), unwrap)
  File "/Users/yp/bin/miniconda3/envs/bcbank/lib/python3.7/site-packages/jigu/client/lcd/lcdclient.py", line 111, in post
    return self._request("post", path, **kwargs)
  File "/Users/yp/bin/miniconda3/envs/bcbank/lib/python3.7/site-packages/jigu/client/lcd/lcdclient.py", line 88, in _request
    return self.handle_response(response)
  File "/Users/yp/bin/miniconda3/envs/bcbank/lib/python3.7/site-packages/jigu/client/lcd/lcdclient.py", line 82, in handle_response
    r = resp_m(self, r)
  File "/Users/yp/bin/miniconda3/envs/bcbank/lib/python3.7/site-packages/jigu/client/lcd/middlewares.py", line 87, in handle_general_errors
    raise LcdInternalError(response.status_code, error_msg, response.request)
jigu.error.LcdInternalError: (500) invalid request: must contain at least one message: failed to simulate tx