Correct way to execute a function in Web3 to avoid “invalid address”?

Question

I am executing a function with Web3 like this:

MyContract.deployed().then(function (contractInstance) {    
      return contractInstance.MyFunction(parameter1, parameter2, { gas: 200000, from: web3.eth.accounts[0] })
    })

This works fine running the app on http://localhost:8080 with Chrome in incognito (so there's no MetaMask, which I have installed) - so the web3.eth.accounts[0] that executes the function will be the account I setup in Geth.

However, if I run the app in a normal Chrome window, where MetaMask will be active (thus it'll be using a different account) the following error will occur:

Uncaught (in promise) Error: invalid address

Removing the web3.eth.accounts[0] part, so I run the function like this:

return contractInstance.SetMessage(key, string1, string2, string3, string4, { gas: 200000})

Also fails. How should this be done correctly?

Answer 1

If you already have geth installed, I'd suggest connecting the Metamask to your geth instance running on http://localhost:8545. There is an option for that in Metamask in the list of available networks.