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I am using the Geth 1.7 console. I tried unlocking the account using personal.unlockAccount(eth.accounts[0], "{top secret password}") but it failed with the following error: first argument must be the account to unlock.

I suspect the error might be due to the fact that eth.accounts[0] is undefined.

How do I set up eth.accounts[0]?

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Please make sure to create an account first before trying to unlock an account residing at the zeroth element in eth.accounts.

To create an account: personal.newAccount('yourPasswordForTheNewAccount')

You are seeing undefined because there is not account to unlock.

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You may need to create a ethereum account.

Please use the following command on the geth console.

personal.newAccount("new passphrase")

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