IllegalThreadState Problem!

1) public class MainClass {
 private static SchedulerTest sch = null;
 public static void main(String[] args) {
  try{
   sch = new SchedulerTest();
   ThreadController tc = new ThreadController(10);
   System.out.println("Starting the ThreadController from main!");
   tc.runTest();
   Thread.sleep(10000);
   System.out.println("Ending Program!");
  }catch(Exception e){
   e.printStackTrace();
  }
  return;
 }
 
 public static synchronized void startSchedulerTest(){
  try{   
   sch.start(); 
  }catch(Exception e){
   e.printStackTrace();
  } 
  return;
 }
}


2) public class ThreadController {
 TestThread[] threads = null;
 public ThreadController(int arg0) {  
  super();
  threads = new TestThread[arg0];  
  System.out.println("Started ThreadController: creating TestThreads!");
  try{
   for(int i = 0; i < arg0; i++){
	threads[i] = new TestThread("Testthread " + (i+1) + "created!");
   }
  }catch(Exception e){
   e.printStackTrace();
  }  
 }
 
 public void runTest(){
  try{
   for(int i = 0; i < threads.length; i++){
	threads[i].start(); 
	//Thread.sleep(2000);   
   }
   System.out.println("Started all TestThreads! Now sleeping in ThreadController!");
   Thread.sleep(5000);
   System.out.println("Woke up in ThreadController! Joining TestThreads...");
   for(int i = 0; i < threads.length; i++){
	threads[i].join();	
   }
  }catch(Exception e){
   e.printStackTrace();
  }
 }
}

3) public class TestThread extends Thread {

 public TestThread() {
  super();
 }

 public TestThread(String arg0) {
  super(arg0);  
  System.out.println("Hello " + arg0);  
 }
 
 public void run(){
  try{
   Thread.sleep(1000);   
   MainClass.startSchedulerTest();
  }catch(Exception e){
   e.printStackTrace();
  }
 }
}

4) public class SchedulerTest extends Thread {
 
 public SchedulerTest(){
  System.out.println("Created SchedulerTest!");
 }
 
 public void run(){
  try{
   System.out.println("In run method of SchedulerTest!");
   Thread.sleep(1000);
  }catch(Exception e){
   e.printStackTrace();
  }
  return;  
 }

}