How do i fix this?

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    so me and my friend have a problem

    we have 2 mods, Pehkui and worldedit with 1 downloaded map

    and yesterday we had a problem that when 1 player joined the server was not lagging but when the second player joined The server crashed and everytime we restarted the server it showed Timed out and we have no idea how to fix it

    please help