4 - Game Manager & Levels

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I am having issues with the code snippets, especially finding classes and variable for GameManager scripit. I have notice some typos that are causing the failed compiles such as isMasterClient, which is actually IsMasterClient, and following statements:
if (!PhotonNetwork.isMasterClient)
public override void OnPhotonPlayerDisconnected(PhotonPlayer other)
public override void OnPhotonPlayerConnected(PhotonPlayer other)

Any Help would be highly appreciated.
Thanks