Column 'ROWCOUNT' doesn't make part of the column map

Can you show me your query (database)?

This "CONT_CEDULA" should be the name of the column which has to be unique. Is email column in your DB named "CONT_CEDULA" ?

yes

You have to show us your query + database structure as @fgomes asked.

Also show us your columnMap() method if you used one in your model.

Yes, I had already done that but in the Apache2 log shows me the following error

[Thu Jun 16 00:19:20.796813 2016] [:error] [pid 1978] [client 127.0.0.1:24238] PHP Catchable fatal error:  Argument 1 passed to Phalcon\\Mvc\\Model::validate() must implement interface Phalcon\\ValidationInterface, instance of Phalcon\\Mvc\\Model\\Validator\\Uniqueness given in /var/www/html/tesis/app/models/SpmContacto.php on line 300, referer: https://localhost/tesis/spm_contacto/new

This looks like version problem to me. Which Phalcon version are you using? Can you read here and perhaps try with the new Validation service.

https://blog.phalcon.io/post/phalcon-2-1-beta-released

Hello, I had already made this change in my model

use Phalcon\Validation;
use Phalcon\Validation\Validator\Email as EmailValidator;
use Phalcon\Validation\Validator\Uniqueness as UniquenessValidator;

 public function validation()
  {
  $this->validate(
  new UniquenessValidator(
  [
  'field'   => 'CONT_CEDULA',
  'message' => 'Sorry, That username is already taken',
  ]
  )
  );

  if ($this->validationHasFailed() == true) {
  return false;
  }
  }

But the result is

[Thu Jun 16 10:46:38.761135 2016] [:error] [pid 9235] [client 127.0.0.1:25166] PHP Catchable fatal error:  Argument 1 passed to Phalcon\\Mvc\\Model::validate() must implement interface Phalcon\\ValidationInterface, instance of Phalcon\\Validation\\Validator\\Uniqueness given in /var/www/html/tesis/app/models/SpmContacto.php on line 300, referer: https://localhost/tesis/spm_contacto/new

Please, paste your full code. (MODEL)

<?php

    use Phalcon\Validation;
    use Phalcon\Http\Request;
    use Phalcon\Validation\Validator\Email as EmailValidator;
    use Phalcon\Validation\Validator\Uniqueness as UniquenessValidator;

    class SpmContacto extends \Phalcon\Mvc\Model {

    public $CONT_CODIGO;
    public $CONT_CEDULA;
    public $CONT_RUCIDE;
    public $CONT_NOMBRE;
    public $CON_ESTADO;
    public $CONT_TELEFO;
    public $CONT_DIRECC;
    public $CONT_AREA;
    public $CONT_CARGO;
    public $CONT_TIPOXX;
    public $CONT_EMAIL;
    public $CONT_USUARIO;
    public $CONT_CLAVE;
    public $CONT_CLAVEE;
    public $CONT_FECNACI;
    public $CONT_FECINSC;
    public $CONT_TIPOCODIGO;

    /**
     * Initialize method for model.
     */
    public function initialize() {
        $this->setSchema("SPOLS");
        $this->hasMany('CONT_CODIGO', 'SPMREFERENCIA', 'CONT_CODIGO', array('alias' => 'SPMREFERENCIA'));
        $this->hasMany('CONT_CODIGO', 'SPTDETALLE', 'CONT_CODIGO', array('alias' => 'SPTDETALLE'));
        $this->hasMany('CONT_CODIGO', 'SPTENCABEZADO', 'CONT_CODIGO', array('alias' => 'SPTENCABEZADO'));

        $this->keepSnapshots(true);

    }

    public function columnMap()  { 
         return array(  'CONT_CODIGO' => 'CONT_CODIGO', 
                      'CONT_CEDULA' => 'CONT_CEDULA', 
                      'CONT_RUCIDE' => 'CONT_RUCIDE', 
                      'CONT_NOMBRE' => 'CONT_NOMBRE', 
                      'CON_ESTADO' => 'CON_ESTADO', 
                      'CONT_TELEFO' => 'CONT_TELEFO', 
                      'CONT_DIRECC' => 'CONT_DIRECC', 
                      'CONT_AREA' => 'CONT_AREA', 
                      'CONT_CARGO' => 'CONT_CARGO', 
                      'CONT_TIPOXX' => 'CONT_TIPOXX', 
                      'CONT_EMAIL' => 'CONT_EMAIL', 
                      'CONT_USUARIO' => 'CONT_USUARIO', 
                      'CONT_CLAVE' => 'CONT_CLAVE', 
                      'CONT_CLAVEE' => 'CONT_CLAVEE', 
                      'CONT_FECNACI' => 'CONT_FECNACI', 
                      'CONT_FECINSC' => 'CONT_FECINSC', 
                      'CONT_TIPOCODIGO' => 'CONT_TIPOCODIGO'  ); 
    }
     public function validation()
    {
    $this->validate(
    new UniquenessValidator(
    [
    'field'   => 'CONT_CEDULA',
    'message' => 'Sorry, That username is already taken',
    ]
    )
    );

    if ($this->validationHasFailed() == true) {
    return false;
    }
    }
    public function getSource() {
        return 'SPM_CONTACTO';
    }

    public static function find($parameters = null) {
        return parent::find($parameters);
    }

    public static function findFirst($parameters = null) {
        return parent::findFirst($parameters);
    }

}