Error trying to execute greeter

I am trying to run the greeter on geth. It is asking for my passphrase and saying that account is unlocked. Also, the ether is 555 in that account. The problem is that greeter address is undefined. I simply cannot figure out why. I also tried to just put a console.log message in the function but that did not get printed cannot figure out anything. I am new to ethereum and would appreciate any help. Please do help!!!
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