title: No valid "from" address specified in neither the given options, nor the default options
body: <p>I am using metamask extension. whenever I am trying to add any data to the rinkeby test network, it is showing this error...plz help me...</p>
  
  <p>I have already logged in to metamask...</p>
  
  <p>it should show a metamask warning box for a transaction, but it is showing this error...</p>