Hello everyone, i try to install my first module to school, don´t work and I don´t know why. The mistake is ¨module not found¨. I paste here the error and the code to models.py and views.xml. Thank you.

---MISTAKE---

Modelo no encontrado: al.taller.propietarios

Contexto del error:
Vista `taller.propietarios.tree`
[view_id: 1020, xml_id: n/a, model: al.taller.propietarios, parent_id: n/a]
None" while parsing /opt/odoo/odoo11/custom-addons/taller/views/views.xml:6, near
<record model="ir.ui.view" id="taller_propietarios_tree">
        <field name="name">taller.propietarios.tree</field>
        <field name="model">al.taller.propietarios</field>
        <field name="arch" type="xml">
          <tree>
            <field name="name"/>
            <field name="nombre"/>
            <field name="apellido1"/>
            <field name="apellido2"/>
          </tree>
        </field>
      </record>

---MODELS.PY---
from odoo import models, fields, api

class taller_propietarios(models.Model):
	_name="al.taller.propietarios"
	name=fields.Char(string="DNI",required=True)
	nombre=fields.Char(string="Nombre",required=True)
	apellido1=fields.Char(string="Primer apellido",required=True)
	apellido2=fields.Char(string="Segundo apellido",required=False)
	coches =  fields.One2many("al.taller.coches",'name',ondelete="cascade")
class taller_mecanicos(models.Model):
	_name="al.taller.mecanicos"
	name=fields.Char(string="Numero empleado",required=True)
	nombre=fields.Char(string="Nombre",required=True)
	puesto=fields.Selection((('0','Mecanico'),('1','Chapista'),('2','Jefe taller')),string="Puesto",required=True)
	coches = fields.Many2many("al.taller.coches",string="Coches a su cargo")
class taller_coches(models.Model):
	_name="al.taller.coches"
	name=fields.Char(string="Matricula",required=True)
	bastidor=fields.Char(string="Bastidor",required=True)
	marca=fields.Char(string="Marca",required=True)
	modelo=fields.Char(string="Modelo",required=True)
	defectos=fields.Text(string="Defectos del vehiculo",required=True)
	propietaros =  fields.Many2one("al.taller.propietarios",string="Propietario",ondelete='cascade')
    mecanicos =  fields.Many2many("al.taller.mecanicos",string="Encargado/s del coche")
class taller_marcas(models.Model):
	_name="al.taller.marcas"
	name=fields.Char(string="Marca",required=True);
	description=fields.Text(string="Descripcion",required=False)
	modelos =  fields.One2many("al.taller.modelos", string="Modelos", 'coches')
class taller_modelos(models.Model):
	_name="al.taller.modelos"
	name=fields.Char(string="Modelos")
	marcas =  fields.Many2one("al.taller.marcas",string="Modelos",ondelete='cascade')

---VIEWS.XML---
<odoo>
  <data>
    
    <!--PROPIETARIOS -->

    <record model="ir.ui.view" id="taller_propietarios_tree">
        <field name="name">taller.propietarios.tree</field>
        <field name="model">al.taller.propietarios</field>
        <field name="arch" type="xml">
          <tree>
            <field name="name"/>
            <field name="nombre"/>
            <field name="apellido1"/>
            <field name="apellido2"/>
          </tree>
        </field>
      </record>

      <record model="ir.ui.view" id="taller_propietarios_form">
        <field name="name">taller.propietarios.form</field>
        <field name="model">al.taller.propietarios</field>
        <field name="arch" type="xml">
          <form>
            <group colspan="2" col="2">
              <field name="name"/>
              <field name="nombre"/>
              <field name="apellido1"/>
              <field name="apellido2"/>
              <field name="coches"/>
            </group>
          </form>
        </field>
      </record>

      <!-- MECANICOS -->

      <record model="ir.ui.view" id="taller_mecanicos_tree">
        <field name="name">taller.mecanicos.tree</field>
        <field name="model">al.taller.mecanicos</field>
        <field name="arch" type="xml">
          <tree>
            <field name="name"/>
            <field name="nombre"/>
            <field name="puesto"/>
            <field name="coches"/>
          </tree>
        </field>
      </record>

      <record model="ir.ui.view" id="taller_mecanicos_form">
        <field name="name">taller.mecanicos.form</field>
        <field name="model">al.taller.mecanicos</field>
        <field name="arch" type="xml">
          <form>
            <group colspan="2" col="2">
              <field name="name"/>
              <field name="nombre"/>
              <field name="puesto"/>
              <field name="coches"/>
            </group>
          </form>
        </field>
      </record>

      <!-- COCHES -->

      <record model="ir.ui.view" id="taller_coches_tree">
        <field name="name">taller.coches.tree</field>
        <field name="model">al.taller.coches</field>
        <field name="arch" type="xml">
          <tree>
            <field name="name"/>
            <field name="bastidor"/>
            <field name="marca"/>
            <field name="modelo"/>
            <field name="defectos"/>
            <field name="propietarios"/>
            <field name="mecanicos"/>
          </tree>
        </field>
      </record>

      <record model="ir.ui.view" id="taller_coches_form">
        <field name="name">taller.coches.form</field>
        <field name="model">al.taller.coches</field>
        <field name="arch" type="xml">
          <form>
            <group colspan="2" col="2">
              <field name="name"/>
              <field name="bastidor"/>
              <field name="marca"/>
              <field name="modelo"/>
              <field name="defectos"/>
              <field name="propietarios"/>
              <field name="mecanicos"/>
            </group>
          </form>
        </field>
      </record>

      <!-- MARCAS -->

      <record model="ir.ui.view" id="taller_marcas_tree">
        <field name="name">taller.marcas.tree</field>
        <field name="model">al.taller.marcas</field>
        <field name="arch" type="xml">
          <tree>
            <field name="name"/>
            <field name="description"/>
            <field name="modelos"/>
          </tree>
        </field>
      </record>

      <record model="ir.ui.view" id="taller_marcas_form">
        <field name="name">taller.marcas.form</field>
        <field name="model">al.taller.marcas</field>
        <field name="arch" type="xml">
          <form>
            <group colspan="2" col="2">
              <field name="name"/>
              <field name="description"/>
              <field name="modelos"/>
            </group>
          </form>
        </field>
      </record>

      <!-- MODELOS -->

      <record model="ir.ui.view" id="taller_modelos_tree">
        <field name="name">taller.modelos.tree</field>
        <field name="model">al.taller.modelos</field>
        <field name="arch" type="xml">
          <tree>
            <field name="name"/>
            <field name="marcas"/>
          </tree>
        </field>
      </record>

      <record model="ir.ui.view" id="taller_modelos_form">
        <field name="name">taller.modelos.form</field>
        <field name="model">al.taller.modelos</field>
        <field name="arch" type="xml">
          <form>
            <group colspan="2" col="2">
              <field name="name"/>
              <field name="marcas"/>
            </group>
          </form>
        </field>
      </record>

      <!-- ACTIONS -->

      <record model="ir.actions.act_window" id="taller.propietarios_action_window">
        <field name="name">taller.propietarios.action_window</field>
        <field name="res_model">al.taller.propietarios</field>
        <field name="view_mode">tree,form</field> 
      </record>

      <record model="ir.actions.act_window" id="taller.mecanicos_action_window">
        <field name="name">taller.mecanicos.action_window</field>
        <field name="res_model">al.taller.mecanicos</field>
        <field name="view_mode">tree,form</field> 
      </record>

      <record model="ir.actions.act_window" id="taller.coches_action_window">
        <field name="name">taller.coches.action_window</field>
        <field name="res_model">al.taller.coches</field>
        <field name="view_mode">tree,form</field> 
      </record>

      <record model="ir.actions.act_window" id="taller_marcas_action_window">
        <field name="name">taller.marcas.action_window</field>
        <field name="res_model">al.taller.marcas</field>
        <field name="view_mode">tree,form</field> 
      </record>

      <record model="ir.actions.act_window" id="taller_modelos_action_window">
        <field name="name">taller.modelos.action_window</field>
        <field name="res_model">al.taller.modelos</field>
        <field name="view_mode">tree,form</field> 
      </record>

      <!-- MENU -->

      <menuitem name="Taller" id="taller.menu_root" />
      <menuitem name="Propietarios" id="taller.propietarios_menu" parent="taller.menu_root" action="taller.propietarios_action_window" />
      <menuitem name="Mecanicos" id="taller.mecanicos_menu" parent="taller.menu_root" action="taller.mecanicos_action_window"/>
      <menuitem name="Coches" id="taller.coches_menu" parent="taller.menu_root" action="taller.coches_action_window" />
      <menuitem name="Marcas" id="taller.marcas_menu" parent="taller.menu_root" action="taller.marcas_action_window" />
      <menuitem name="Modelos" id="taller.modelos_menu" parent="taller.menu_root" action="taller.modelos_action_window" />
  </data>
</odoo>