I am trying to write my first contract and am following the tutorial here:https://dappsforbeginners.wordpress.com/tutorials/your-first-dapp/
I copy paste the source code exactly as is. And the 'Execute' button is greyed out with compile error:
ERROR Solidity: Error: Successor block not found.
Could I please know whats going wrong here? I am using a private chain if that matters.