static method error

Hi!

i'm trying to implement a simple application consisting of this classes:

/*
 * Concesionari.java
 *
 * Created on 14 de abril de 2006, 2:40
 *
 * To change this template, choose Tools | Options and locate the template under
 * the Source Creation and Management node. Right-click the template and choose
 * Open. You can then make changes to the template in the Source Editor.
 */



package concesionario;

import java.io.*;
import java.util.*;



/**
 *
 *
 */
public class Concesionari {

    String name;
    Store concesionari;
   
   
       
    /** Creates a new instance of Concesionari */
    public Concesionari() {
          this.name = name;
      concesionari = new Store();
   
    }
 

 

public boolean add(Vehicle vehiculo) {
            return Store.add(vehiculo);
      }
 
}



/*
 * Vehicle.java
 *
 * Created on 13 de abril de 2006, 3:59
 *
 * To change this template, choose Tools | Options and locate the template under
 * the Source Creation and Management node. Right-click the template and choose
 * Open. You can then make changes to the template in the Source Editor.
 */

package concesionario;

/**
 *
 * @author jolivan
 */


public class Vehicle {
   
    private float preu;
    private int any;
    private String model;
    private String numplate;
   
   
    /** Creates a new instance of Vehicle */
    public Vehicle(float preu, int any, String model, String numplate) {
                       
        setPreu(preu);
        setAnyFabricacio(any);
        setModel(model);
        setMatricula(numplate);
        getMatricula();
    }
   
   
    void setPreu(float preu) {
    this.preu = preu;
    }
   
    void setAnyFabricacio(int any) {
    this.any = any;
    }
   
    void setModel(String model) {
    this.model = model;
    }
   
    void setMatricula(String numplate) {
    this.numplate = numplate;
    }
   
    String getMatricula(){
        return this.numplate;
    }

}



/*
 * Store.java
 *
 * Created on 15 de abril de 2006, 5:57
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package concesionario;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;


/**
 * Aggregate of products for sale
 *
 * @author UOC
 * @version 1.0
 */
public class Store {
      /**
       * Product container
       *
       * @see Collection
       */
      private List vehiculos;

      /**
       * By default, the store uses an <code>ArrayList</code> as container
       */
      public Store() {
            vehiculos = new ArrayList();
      }
      
      /**
       * Class constructor. The store is created as the contained implementation
       * is specified (this must have been created)
       *
       * @param products
       *            Container to be used
       * @throws NullCollectionException
       *             The container has not been created
       */
      public Store(List vehiculos) {
            if (vehiculos != null) {
                  this.vehiculos = vehiculos;
            }
      }

      /**
       * Adds a product to the store
       *
       * @param product
       *            Product to add
       * @return <code> true </code> if correct. Otherwise <code> false </code>
       */
      public boolean add(Vehicle vehiculo) {
            return vehiculos.add(vehiculo);
      }

      /**
       * Removes a product from the store
       *
       * @param product
       *            Product to remove
       * @return <code> true </code> if correct. Otherwise <code> false </code>
       */
      public boolean remove(Vehicle vehiculo) {
            return vehiculos.remove(vehiculo);
      }

      /**
       * Shows the list of products in the store.
       */
      public void show() {
            List copy = new ArrayList(vehiculos);
            Collections.sort(copy);
            Iterator iterator = copy.iterator();
            while (iterator.hasNext()) {
                  System.out.println((Vehicle)iterator.next());
            }
      }

}



But when i tried to compile: C:\Documents and Settings\Administrador\Mis documentos\UOC\POO\Concesionario\src\concesionario\Concesionari.java:42: non-static method add(concesionario.Vehicle) cannot be referenced from a static context
                return Store.add(vehiculo);

and i cannot see where is the static context i'm referencing to... can u help me plz? =)

Thanks!