Error:
Odoo Server Error

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_ui_view.py", line 392, in _check_xml
    self.postprocess_and_fields(view.model, view_doc, view.id)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_ui_view.py", line 931, in postprocess_and_fields
    self.raise_view_error(_('Model not found: %(model)s') % dict(model=model), view_id)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_ui_view.py", line 592, in raise_view_error
    raise ValueError(message)
ValueError: Modelo no encontrado: openacademy.course

Contexto del error:
Vista `course.form`
[view_id: 678, xml_id: n/a, model: openacademy.course, parent_id: n/a]

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/odoo/tools/convert.py", line 713, in parse
    self._tag_root(de)
  File "/usr/lib/python3/dist-packages/odoo/tools/convert.py", line 675, in _tag_root
    f(rec)
  File "/usr/lib/python3/dist-packages/odoo/tools/convert.py", line 578, in _tag_record
    record = model._load_records([data], self.mode == 'update')
  File "/usr/lib/python3/dist-packages/odoo/models.py", line 4070, in _load_records
    records = self._load_records_create([data['values'] for data in to_create])
  File "/usr/lib/python3/dist-packages/odoo/addons/website/models/ir_ui_view.py", line 148, in _load_records_create
    records = super(View, self)._load_records_create(values)
  File "/usr/lib/python3/dist-packages/odoo/models.py", line 3984, in _load_records_create
    return self.create(values)
  File "<decorator-gen-31>", line 2, in create
  File "/usr/lib/python3/dist-packages/odoo/api.py", line 344, in _model_create_multi
    return create(self, arg)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_ui_view.py", line 473, in create
    return super(View, self).create(vals_list)
  File "<decorator-gen-3>", line 2, in create
  File "/usr/lib/python3/dist-packages/odoo/api.py", line 344, in _model_create_multi
    return create(self, arg)
  File "/usr/lib/python3/dist-packages/odoo/models.py", line 3765, in create
    fields[0].determine_inverse(batch_recs)
  File "/usr/lib/python3/dist-packages/odoo/fields.py", line 1096, in determine_inverse
    getattr(records, self.inverse)()
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_ui_view.py", line 299, in _inverse_arch
    view.write(data)
  File "/usr/lib/python3/dist-packages/odoo/addons/website/models/ir_ui_view.py", line 51, in write
    return super(View, self).write(vals)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_ui_view.py", line 490, in write
    return super(View, self).write(self._compute_defaults(vals))
  File "/usr/lib/python3/dist-packages/odoo/models.py", line 3554, in write
    real_recs._validate_fields(set(vals) - set(inverse_fields))
  File "/usr/lib/python3/dist-packages/odoo/models.py", line 1167, in _validate_fields
    check(self)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_ui_view.py", line 394, in _check_xml
    raise ValidationError("%s\n\n%s" % (_("Error while validating view"), tools.ustr(e)))
odoo.exceptions.ValidationError: ('Error while validating view\n\nModelo no encontrado: openacademy.course\n\nContexto del error:\nVista `course.form`\n[view_id: 678, xml_id: n/a, model: openacademy.course, parent_id: n/a]', None)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 619, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 309, in _handle_exception
    raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
  File "/usr/lib/python3/dist-packages/odoo/tools/pycompat.py", line 14, in reraise
    raise value
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 664, in dispatch
    result = self._call_function(**self.params)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 345, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/odoo/service/model.py", line 93, in wrapper
    return f(dbname, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 338, in checked_call
    result = self.endpoint(*a, **kw)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 909, in __call__
    return self.method(*args, **kw)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 510, in response_wrap
    response = f(*args, **kw)
  File "/usr/lib/python3/dist-packages/odoo/addons/web/controllers/main.py", line 1323, in call_button
    action = self._call_kw(model, method, args, kwargs)
  File "/usr/lib/python3/dist-packages/odoo/addons/web/controllers/main.py", line 1311, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "/usr/lib/python3/dist-packages/odoo/api.py", line 395, in call_kw
    result = _call_kw_multi(method, model, args, kwargs)
  File "/usr/lib/python3/dist-packages/odoo/api.py", line 382, in _call_kw_multi
    result = method(recs, *args, **kwargs)
  File "<decorator-gen-58>", line 2, in button_immediate_install
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_module.py", line 72, in check_and_log
    return method(self, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_module.py", line 463, in button_immediate_install
    return self._button_immediate_function(type(self).button_install)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_module.py", line 573, in _button_immediate_function
    modules.registry.Registry.new(self._cr.dbname, update_module=True)
  File "/usr/lib/python3/dist-packages/odoo/modules/registry.py", line 85, in new
    odoo.modules.load_modules(registry._db, force_demo, status, update_module)
  File "/usr/lib/python3/dist-packages/odoo/modules/loading.py", line 420, in load_modules
    loaded_modules, update_module, models_to_check)
  File "/usr/lib/python3/dist-packages/odoo/modules/loading.py", line 312, in load_marked_modules
    perform_checks=perform_checks, models_to_check=models_to_check
  File "/usr/lib/python3/dist-packages/odoo/modules/loading.py", line 222, in load_module_graph
    load_data(cr, idref, mode, kind='data', package=package, report=report)
  File "/usr/lib/python3/dist-packages/odoo/modules/loading.py", line 68, in load_data
    tools.convert_file(cr, package.name, filename, idref, mode, noupdate, kind, report)
  File "/usr/lib/python3/dist-packages/odoo/tools/convert.py", line 737, in convert_file
    convert_xml_import(cr, module, fp, idref, mode, noupdate, report)
  File "/usr/lib/python3/dist-packages/odoo/tools/convert.py", line 804, in convert_xml_import
    obj.parse(doc.getroot())
  File "/usr/lib/python3/dist-packages/odoo/tools/convert.py", line 722, in parse
    exc_info[2]
  File "/usr/lib/python3/dist-packages/odoo/tools/pycompat.py", line 13, in reraise
    raise value.with_traceback(tb)
  File "/usr/lib/python3/dist-packages/odoo/tools/convert.py", line 713, in parse
    self._tag_root(de)
  File "/usr/lib/python3/dist-packages/odoo/tools/convert.py", line 675, in _tag_root
    f(rec)
  File "/usr/lib/python3/dist-packages/odoo/tools/convert.py", line 578, in _tag_record
    record = model._load_records([data], self.mode == 'update')
  File "/usr/lib/python3/dist-packages/odoo/models.py", line 4070, in _load_records
    records = self._load_records_create([data['values'] for data in to_create])
  File "/usr/lib/python3/dist-packages/odoo/addons/website/models/ir_ui_view.py", line 148, in _load_records_create
    records = super(View, self)._load_records_create(values)
  File "/usr/lib/python3/dist-packages/odoo/models.py", line 3984, in _load_records_create
    return self.create(values)
  File "<decorator-gen-31>", line 2, in create
  File "/usr/lib/python3/dist-packages/odoo/api.py", line 344, in _model_create_multi
    return create(self, arg)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_ui_view.py", line 473, in create
    return super(View, self).create(vals_list)
  File "<decorator-gen-3>", line 2, in create
  File "/usr/lib/python3/dist-packages/odoo/api.py", line 344, in _model_create_multi
    return create(self, arg)
  File "/usr/lib/python3/dist-packages/odoo/models.py", line 3765, in create
    fields[0].determine_inverse(batch_recs)
  File "/usr/lib/python3/dist-packages/odoo/fields.py", line 1096, in determine_inverse
    getattr(records, self.inverse)()
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_ui_view.py", line 299, in _inverse_arch
    view.write(data)
  File "/usr/lib/python3/dist-packages/odoo/addons/website/models/ir_ui_view.py", line 51, in write
    return super(View, self).write(vals)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_ui_view.py", line 490, in write
    return super(View, self).write(self._compute_defaults(vals))
  File "/usr/lib/python3/dist-packages/odoo/models.py", line 3554, in write
    real_recs._validate_fields(set(vals) - set(inverse_fields))
  File "/usr/lib/python3/dist-packages/odoo/models.py", line 1167, in _validate_fields
    check(self)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_ui_view.py", line 394, in _check_xml
    raise ValidationError("%s\n\n%s" % (_("Error while validating view"), tools.ustr(e)))
odoo.tools.convert.ParseError: "Error while validating view

Modelo no encontrado: openacademy.course

Contexto del error:
Vista `course.form`
[view_id: 678, xml_id: n/a, model: openacademy.course, parent_id: n/a]
None" while parsing /mnt/extra-addons/openacademy/views/openacademy.xml:2, near
<odoo>
    <record model="ir.ui.view" id="course_form_view">
        <field name="name">course.form</field>
        <field name="model">openacademy.course</field>
        <field name="arch" type="xml">
            <form string="Course Form">
                <header>
                    <button string="Confirm" type="object" name="action_confirm" states="draft" class="oe_highlight"/>
                    <button string="Mark as done" type="object" name="action_done" states="confirmed" class=" highlight "/>
                    <button string="Reset to draft" type="object" name="action_draft" states="confirmed,done"/>
                    <field name="state" widget="statusbar"/>
                </header>
                    <sheet>
                        <div class="oe_title">
                            <label for="name" class="oe_edit_only" string="Idea Name"/>
                            <h1><field name="name"/></h1>
                        </div>
                        <separator string="General" colspan="2"/>
                        <group colspan="2" col="2">
                            <field name="name"/>
                            <field name="responsible_id"/>
                        </group>
                        <notebook>
                            <page string="Description">
                                <field name="description" placeholder="Idea description..."/>
                            </page>
                            <page string="Sessions">
                                <field name="session_ids">
                                    <tree string="Registered sessions">
                                        <field name="name"/>
                                        <field name="instructor_id"/>
                                    </tree>
                                </field>
                            </page>
                            <page string="Duracion">
                                <field name="duracion"/>
                            </page>
                            <page string="About"/>
                        </notebook>
                    </sheet>
            </form>
        </field>
    </record>
    <record model="ir.ui.view" id="course_search_view">
        <field name="name">course.search</field>
        <field name="model">openacademy.course</field>
        <field name="arch" type="xml">
            <search>
                <field name="name"/>
                <field name="description"/>
            </search>
        </field>
    </record>
        <!-- session form view -->
    <record model="ir.ui.view" id="session_form_view">
        <field name="name">session.form</field>
        <field name="model">openacademy.session</field>
        <field name="arch" type="xml">
            <form string="Session Form">
                <sheet>
                    <group string="General">
                        <field name="course_id"/>
                        <field name="name"/>
                        <field name="instructor_id"/>
                    </group>
                    <group>
                        <field name="name"/>
                        <field name="start_date"/>
                        <field name="duration"/>
                        <field name="seats"/>
                    </group>
                    <label for="attendee_ids"/>
                    <field name="attendee_ids"/>
                </sheet>
            </form>
        </field>
    </record>
    <!-- override the automatically generated list view for courses -->
    <record model="ir.ui.view" id="course_tree_view">
        <field name="name">course.tree</field>
        <field name="model">openacademy.course</field>
        <field name="arch" type="xml">
            <tree string="Course Tree">
                <field name="name"/>
                <field name="responsible_id"/>
            </tree>
        </field>
    </record>
        <!-- session tree/list view -->
    <record model="ir.ui.view" id="session_tree_view">
        <field name="name">session.tree</field>
        <field name="model">openacademy.session</field>
        <field name="arch" type="xml">
            <tree string="Session Tree">
                <field name="name"/>
                <field name="course_id"/>
            </tree>
        </field>
    </record>
        <!-- window action -->
        <!--
            The following tag is an action definition for a "window action",
            that is an action opening a view or a set of views
        -->
    <record model="ir.actions.act_window" id="course_list_action">
        <field name="name">Courses</field>
        <field name="res_model">openacademy.course</field>
        <field name="view_mode">tree,form</field>
        <field name="help" type="html">
            <p class="o_view_nocontent_smiling_face">Create the first course</p>
        </field>
    </record>
    <record model="ir.actions.act_window" id="session_list_action">
        <field name="name">Sessions</field>
        <field name="res_model">openacademy.session</field>
    </record>
<!-- top level menu: no parent -->
    <menuitem id="main_openacademy_menu" name="Open Academy"/>
    <!-- A first level in the left side menu is needed before using action= attribute -->
    <menuitem id="openacademy_menu" name="Open Academy" parent="main_openacademy_menu"/>
    <!-- the following menuitem should appear *after* its parent openacademy_menu and *after* its action course_list_action -->
    <menuitem id="courses_menu" name="Courses" parent="openacademy_menu" action="course_list_action"/>
        <!-- Full id location:
             action="openacademy.course_list_action"
             It is not required when it is the same module -->
    <menuitem id="session_menu" name="Sessions" parent="openacademy_menu" action="session_list_action"/>
</odoo>