Server Closed upon trying to join.

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    So upon opening the server, It works out fine. Opens normally, and then displaying how many time left before it closes.
    But upon joining, My screen says "Loading Terrain" and then after that, it quickly disconnects me aswell as shut the server down.
    I haven't found a fix for this yet so hopefully someone can help me! (The log is sent above)

    Another error that comes up sometimes when disconnecting is: