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I am creating a private network with Ethereum following instructions from here . I managed to run the network but my problem is when try to deploy a contract following error comes:

{'code':-320000, 'message':'invalid sender'}

After research on forums, I understand this is an unauthroized key error or may be chainId is invalid. So I checked the .json file which was generated at the time of network creation and through which I initialised the network. In this file, the chainId is correct that is 58343 but when I try to print this chainId from web3 code , it is giving me chainId 0 that is mainnet. I have also setted up chain from transaction and sending contract transactions like this:

contract_data = contract_.constructor().buildTransactions({ 'from: acct.address', 'gas':1732233', 'gasPrice': web3.toWei('21','gwei'), 'chainId':58343})

Note: Above is the working code which I used to deploy several contracts on Ethereum Ropsten Testnet, for this project only added chainId after reading on forums.

Your help is much appreciated.

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