Java - SQLite - Error Querying the Database

I am a beginner and I am creating a small applet designed to carry out the academic control of the students in the Course where I work. I'm using Java + SQLite for the permanence of the data.

I'm trying to query in my database, but I'm having trouble. The method is returning a SQLFeatureNotSupportedException error.

Does anyone know which feature the error refers to?

Follow my code:

try {

    Statement s;
    s = conexao.createStatement();

    ResultSet resultado
            = s.executeQuery("SELECT keyCurriculo FROM Curriculo\n"
                    + "WHERE anoCurriculo='" + aluno.getCurriculoAluno()
                    + "' AND codCurso='" + aluno.getCursoAluno() + "';");

    KeyCurriculo = resultado.getNString(1);

    s.close();

} catch (SQLException erroSQL) {
    System.out.println("Erro na consulta ao banco: " + erroSQL.getMessage());
    erroSQL.printStackTrace();
    return false;

} catch (Exception e) {
    System.out.println("Ocorreu um erro na consulta ao banco: " + e.getMessage());
    return false;
}

printStackTrace () :

run:
Erro na consulta ao banco: null
java.sql.SQLFeatureNotSupportedException
    at org.sqlite.jdbc4.JDBC4ResultSet.getNString(JDBC4ResultSet.java:146)
    at PacoteConexao.UpdateAluno.atualizarAlunoCSV(UpdateAluno.java:46)
    at controle_academico_mat.main(controle_academico_mat.java:30)
CONSTRUÍDO COM SUCESSO (tempo total: 9 segundos)-->

Can anyone help?