[andrewgrob]

public isPlayerInArea()
{
printf("Player %i left a checkpoint!",playerid);
SendClientMessageToAll(0xDEEE20FF, "Hello.");
return 1;
}

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SendClientMessageToAll(0xDEEE20FF, "Hello."); --- i added that above . but you dont need that
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just

public isPlayerInArea()
{
printf("Player %i left a checkpoint!",playerid);
return 1;
}