build-impl.xml: 930: The following error occurred while executing this line:

I'm doing a college project, and every class I put to inherit from the Modelo class, I get those errors.

  

/home/tavz-correia/NetBeansProjects/exercicio01/AccessoriesForVehicles/nbproject/build-impl.xml:930: The following error occurred while executing this line:

     

/home/tavz-correia/NetBeansProjects/exercicio01/AccessoriesForVehicles/nbproject/build-impl.xml:270: Compile failed; see the compiler error output for details.

Class Modelo.java :

package acessoriosveiculos;

import java.io.FileReader;
import java.util.List;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;

/**
 *
 * @author tavz-correia
 */
public class Modelo {

         private List<String> modelos;

    public Modelo() throws Exception{

        List<String> lista = ler("/home/tavz-correia/NetBeansProjects/exercicio01/AcessoriosVeiculos/src/acessoriosveiculos/ObjetosSerializados/Modelos.ser");
        this.setModelos(lista);
    }

    public List<String> getModelos() {
        return modelos;
    }

    public void setModelos(List<String> modelo) {
        this.modelos = modelo;
    }

    @SuppressWarnings("unchecked")
    public List<String> ler(String caminho) throws Exception {

        JSONParser parser = new JSONParser();
        FileReader arquivo = new FileReader("/home/tavz-correia/NetBeansProjects/exercicio01/AcessoriosVeiculos/src/acessoriosveiculos/ObjetosSerializados/Modelos.json");
        JSONObject jsonObject = (JSONObject) parser.parse(arquivo);
        List<String> lista = (List<String>) jsonObject.get("modelos");

        return lista;
    }
}

Could anyone help me?