Problems with using BukkitTask

So I want to create a TaskTimer that cancells itself after repeating something for 10 seconds..
I want to use it in my Listener, but it always gives me the Error "PluginName cannot be null"

I deleted my code thanks to rage, so could you please help me with bukkittasks? I also can´t use an extra class for the Task, because in my run() part, i have local variables and stuff :c

 

As i said, i deleted it.. It was something like this:

PHP:

new BukkitRunnable() {

public void run() {
p.playEffect....

}
}.runTaskTimer(plugin, 20, 10000);

 

Use this

Code:

new BukkitRunnable(){
int seconds = 0;
public void run(){
seconds++;
//do stuff each second
if(seconds >= 10){
//cancel it
}
}.runTaskTimer(plugin,20L, 20L);

Main - class extended from JavaPlugin
you can use Main.getPlugin(Main.class) instaed of plugin.