Cannot get my timer for my mini-game to work

So here is my problem, I have a timer class that I am trying to make handle the countdowns and things like that, I am calling it in the onEnable but it only gets to a certain point and then stops running(It will say"I am sorry but the game requires "+Core.minPlayers+" to start!"). I am pretty familiar with java and bukkit so I will most likely know what you are talking about, the only thing is most of my plugins do not require timers. Here is my code

Timer Class:

public class timeManager implements Runnable
{

public final int lobbyTimer = 120;
public final int warmupTimer = 60;

@Override
public void run()
{
//If the timer is larger than one
if(Core.getTicks()>1)
{
Core.setTicks(Core.getTicks()-1);
}

//This is setting up the lobby timer
if(Core.getState()==GameState.Lobby)
{

if(Core.getTicks()>0&&Core.getTicks()<=10||Core.getTicks()>0&&Core.getTicks()%30==0)
{
Bukkit.broadcastMessage(Core.TAG+"The game begins in "+Core.formatTime(Core.getTicks())+"...");

for(Player pl:Bukkit.getOnlinePlayers())
{
pl.playSound(pl.getLocation(), Sound.CLICK, 100, 100);

}
}
if(Core.getTicks()==0)
{
if(Bukkit.getOnlinePlayers().length>=Core.minPlayers)
{
//TODO start the game in warmup, loop through the online players and then set the paper to a new gamestate
//add the warmup timer
}
else
{
Core.setTicks(lobbyTimer);
Bukkit.broadcastMessage(Core.TAG+"I am sorry but the game requires "+Core.minPlayers+" to start!");
Core.setTicks(lobbyTimer);
for(Player pl: Bukkit.getOnlinePlayers())
{
pl.playSound(pl.getLocation(), Sound.CLICK, 100, 100);
}
}
}
}

Main Class:

public class Core extends JavaPlugin
{
@Override
public void onEnable()
{

//Trying to run the timer

getServer().getScheduler().runTask(this, new timeManager());


}

public static int ticks = 0;

public static void setTicks(int ticks)
{
Core.ticks=ticks;
}

public static int getTicks()
{
return Core.ticks;
}

public static GameState state;

public static void setState(GameState state)
{
Core.state= state;
}

public static GameState getState()
{
return Core.state;
}
}

Sorry for the code mess, I do not know how to format the code like the other people who post but I really need help with this!