why this entry not can be deserialized?

package framework.exemples.primos;

import framework.*;

public class TaskPrimos extends GenericTask
{

    public ResultPrimos resultado;    
    public Integer length;
    public Integer [] nums;
    public Integer [] primos;
    public Integer quant=new Integer(0);
    
    public TaskPrimos()
    {
        
    }
    public TaskPrimos(Integer nums[])
    {
         this.length = new Integer(nums.length);
         this.nums = nums;
         
    }
    
//    public void run()
//    {
//        resultado = (PrimosResult) execute();
//    }
//    
    public Boolean isPrime(int num)
    {
        double raiz = Math.sqrt(num); 
        
        for (int i=2;i<=raiz;i++)
        {
            if (num % i == 0)
            {
                return new Boolean (false);                
            }
            
        }
        return new Boolean (true);        
    }

    public AbstractResult execute()
    {       
        
        int j=0;
        ResultPrimos resultado = new ResultPrimos();
        
        for (int i=0;i<length.intValue();i++)
        {
            if (isPrime(nums[i].intValue()).booleanValue())
            {
                primos[j++] = nums[i];                
                quant = new Integer(j);
            }            
        }
        System.out.println("passou por aqui");
        resultado.quant = quant;
        resultado.primos = primos;  
                
        return resultado;
    }

}


the exception raised:

net.jini.core.entry.UnusableEntryException  
net.jini.core.entry.UnusableEntryException
	at com.sun.jini.outrigger.EntryRep.throwNewUnusableEntryException(EntryRep.java:914)
	at com.sun.jini.outrigger.EntryRep.entry(EntryRep.java:490)
	at com.sun.jini.outrigger.SpaceProxy.entryFrom(SpaceProxy.java:556)
	at com.sun.jini.outrigger.SpaceProxy.take(SpaceProxy.java:420)

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