The transaction declared chain ID 5777, but the connected node is on 1337

I am trying to deploy my SimpleStorage.sol contract to a ganache local chain by making a transaction using python. It seems to have trouble connecting to the chain.

from solcx import compile_standard
from web3 import Web3
import json
import os
from dotenv import load_dotenv

load_dotenv()

with open("./SimpleStorage.sol", "r") as file:
    simple_storage_file = file.read()

compiled_sol = compile_standard(
    {
        "language": "Solidity",
        "sources": {"SimpleStorage.sol": {"content": simple_storage_file}},
        "settings": {
            "outputSelection": {
                "*": {"*": ["abi", "metadata", "evm.bytecode", "evm.sourceMap"]}
            }
        },
    },
    solc_version="0.6.0",
)

with open("compiled_code.json", "w") as file:
    json.dump(compiled_sol, file)


# get bytecode
bytecode = compiled_sol["contracts"]["SimpleStorage.sol"]["SimpleStorage"]["evm"][
    "bytecode"
]["object"]


# get ABI
abi = compiled_sol["contracts"]["SimpleStorage.sol"]["SimpleStorage"]["abi"]

# to connect to ganache blockchain
w3 = Web3(Web3.HTTPProvider("HTTP://127.0.0.1:7545"))
chain_id = 5777
my_address = "0xca1EA31e644F13E3E36631382686fD471c62267A"
private_key = os.getenv("PRIVATE_KEY")


# create the contract in python

SimpleStorage = w3.eth.contract(abi=abi, bytecode=bytecode)

# get the latest transaction
nonce = w3.eth.getTransactionCount(my_address)

# 1. Build a transaction
# 2. Sign a transaction
# 3. Send a transaction


transaction = SimpleStorage.constructor().buildTransaction(
    {"chainId": chain_id, "from": my_address, "nonce": nonce}
)
print(transaction)

It seems to be connected to the ganache chain because it prints the nonce, but when I build and try to print the transaction here is the entire traceback call I am receiving

Traceback (most recent call last):
File "C:Usersevensdemosweb3_py_simple_storagedeploy.py", line 
52, in <module>
transaction = SimpleStorage.constructor().buildTransaction(
File "C:Python310libsite-packageseth_utilsdecorators.py", line 
18, in _wrapper
return self.method(obj, *args, **kwargs)
File "C:UsersevensAppDataRoamingPythonPython310site- 
packagesweb3contract.py", line 684, in buildTransaction
return fill_transaction_defaults(self.web3, built_transaction)
File "cytoolz/functoolz.pyx", line 250, in 
cytoolz.functoolz.curry.__call__
return self.func(*args, **kwargs)
File "C:UsersevensAppDataRoamingPythonPython310site- 
packagesweb3_utilstransactions.py", line 114, in 
fill_transaction_defaults
default_val = default_getter(web3, transaction)
File "C:UsersevensAppDataRoamingPythonPython310site- 
packagesweb3_utilstransactions.py", line 60, in <lambda>
'gas': lambda web3, tx: web3.eth.estimate_gas(tx),
File "C:UsersevensAppDataRoamingPythonPython310site- 
packagesweb3eth.py", line 820, in estimate_gas
return self._estimate_gas(transaction, block_identifier)
File "C:UsersevensAppDataRoamingPythonPython310site- 
packagesweb3module.py", line 57, in caller
result = w3.manager.request_blocking(method_str,
File "C:UsersevensAppDataRoamingPythonPython310site- 
packagesweb3manager.py", line 197, in request_blocking
response = self._make_request(method, params)
File "C:UsersevensAppDataRoamingPythonPython310site- 
packagesweb3manager.py", line 150, in _make_request
return request_func(method, params)
File "cytoolz/functoolz.pyx", line 250, in 
cytoolz.functoolz.curry.__call__
return self.func(*args, **kwargs)
File "C:UsersevensAppDataRoamingPythonPython310site- 
packagesweb3middlewareformatting.py", line 76, in 
apply_formatters
response = make_request(method, params)
File "C:UsersevensAppDataRoamingPythonPython310site- 
packagesweb3middlewaregas_price_strategy.py", line 90, in 
middleware
return make_request(method, params)
File "cytoolz/functoolz.pyx", line 250, in 
cytoolz.functoolz.curry.__call__
return self.func(*args, **kwargs)
File "C:UsersevensAppDataRoamingPythonPython310site- 
packagesweb3middlewareformatting.py", line 74, in 
apply_formatters
response = make_request(method, formatted_params)
File "C:UsersevensAppDataRoamingPythonPython310site- 
packagesweb3middlewareattrdict.py", line 33, in middleware
response = make_request(method, params)
File "cytoolz/functoolz.pyx", line 250, in 
cytoolz.functoolz.curry.__call__
return self.func(*args, **kwargs)
File "C:UsersevensAppDataRoamingPythonPython310site- 
packagesweb3middlewareformatting.py", line 74, in 
apply_formatters
response = make_request(method, formatted_params)
File "cytoolz/functoolz.pyx", line 250, in 
cytoolz.functoolz.curry.__call__
return self.func(*args, **kwargs)
File "C:UsersevensAppDataRoamingPythonPython310site- 
packagesweb3middlewareformatting.py", line 73, in 
apply_formatters
formatted_params = formatter(params)
File "cytoolz/functoolz.pyx", line 503, in 
cytoolz.functoolz.Compose.__call__
ret = PyObject_Call(self.first, args, kwargs)
File "cytoolz/functoolz.pyx", line 250, in 
cytoolz.functoolz.curry.__call__
return self.func(*args, **kwargs)
File "C:Python310libsite-packageseth_utilsdecorators.py", line 
91, in wrapper
return ReturnType(result)  # type: ignore
File "C:Python310libsite-packageseth_utilsapplicators.py", line 
22, in apply_formatter_at_index
yield formatter(item)
File "cytoolz/functoolz.pyx", line 250, in 
cytoolz.functoolz.curry.__call__
File "cytoolz/functoolz.pyx", line 250, in 
cytoolz.functoolz.curry.__call__
return self.func(*args, **kwargs)
File "C:Python310libsite-packageseth_utilsapplicators.py", line 
72, in apply_formatter_if
return formatter(value)
File "cytoolz/functoolz.pyx", line 250, in 
cytoolz.functoolz.curry.__call__
return self.func(*args, **kwargs)
File "C:UsersevensAppDataRoamingPythonPython310site- 
packagesweb3middlewarevalidation.py", line 57, in 
validate_chain_id
raise ValidationError(
web3.exceptions.ValidationError: The transaction declared chain ID 
5777, but the connected node is on 1337

Answer

Had this issue myself, apparently it’s some sort of Ganache CLI error but the simplest fix I could find was to change the network id in Ganache through settings>server to 1337. It restarts the session so you’d then need to change the address and private key variable.

If it’s the same tutorial I’m doing, you’re likely to come unstuck after this… the code for transaction should be:

transaction = 
 SimpleStorage.constructor().buildTransaction( {
    "gasPrice": w3.eth.gas_price, 
    "chainId": chain_id, 
    "from": my_address, 
    "nonce": nonce, 
})
print(transaction)

Otherwise you get a value error if you don’t set the gasPrice