Hi all. I'm fairly new to Odoo and I'm currently trying to set up submenus within my module. Unfortunately, it's not working. I'm getting this error:

Exception: Module loading training_module failed: file training_module\security/ir.model.access.csv could not be processed: 
No matching record found for external id 'model_trainers_trainer' in field 'Model' 
Missing required value for the field 'Model' (model_id)

My ir.security.access.csv file looks like this:

id,name,model_id/id,group_id/id,perm_read,perm_write,perm_create,perm_unlink
access_openacademy_openacademy,openacademy.openacademy,model_openacademy_openacademy,,1,0,0,0
access_trainers_trainer,trainers.trainer,model_trainers_trainer,,1,0,0,0

My views file looks like this:

<?xml version="1.0" encoding="utf-8" ?>
<odoo>
    <data>
        <record model="ir.actions.act_window" id="trainee_action_window">
            <field name="name">Trainees</field>
            <field name="res_model">openacademy.openacademy</field>
            <field name="view_mode">form,tree</field>
        </record>
        <record model="ir.actions.act_window" id="trainer_action_window">
            <field name="name">Trainees 2</field>
            <field name="res_model">trainers.trainer</field>
            <field name="view_mode">form,tree</field>
        </record>




<!--        <record id="sequence_menu_view" model="ir.ui.view">-->
<!--            <field name="name">Sequence Order</field>-->
<!--            <field name="model">openacademy.openacademy</field>-->
<!--            <field name="arch" type="xml">-->
<!--                <form string="Sequence Order">-->
<!--                <sheet>-->
<!--                        <div class="oe_title">-->
<!--                            <h1>-->
<!--                            <field name="sequence" readonly="1"/>-->
<!--                        </h1>-->
<!--                        </div>-->
<!--                </sheet>-->
<!--                </form>-->
<!--            </field>-->
<!--        </record>-->








<menuitem name="Open Academy" id="openacademy_parent_menu_id"/>
<menuitem name="Trainee Master" id="openacademy_submenu1" parent="openacademy_parent_menu_id" action="trainee_action_window"/>
<menuitem name="Trainer Master" id="openacademy_submenu2" parent="openacademy_parent_menu_id" action="trainer_action_window"/>
<!--<menuitem name="Academey" id="openacadmey_submenu3" parent="openacademy_submenu1" action="openacademy_action_window"/>-->
<!--<menuitem name="Academey2" id="openacadmey_submenu4" parent="openacademy_submenu2" action="openacademy_action_window"/>-->



        <!--Action name is taken from the action we defined earlier in record model-->
        <!--Don't forget to upgrade module after making changes-->
        <!--Both a menu and an action are required to have the module show up in Odoo. The lowest menu item - in this case Acamey - must have the action.-->
        <!--This also goes for submenus - they must also have this action on the lowest level part of the module in order to show up.-->

    </data>
</odoo>

And the file of the action I'm trying to create looks like this:

from odoo import fields, models, api

class trainers(models.Model):
    _name = 'trainers.trainer'

    name = fields.Char()
    fname = fields.Char('First Name', required=True)
    profile_pic=fields.Binary()
    lname=fields.Char('Last Name')


def trainer_name_concat(self):
    for name in self:
        fullname = fname + " " + lname
    pass

I do have another working action showing up in my module (openacademy.openacademy), so I'm not sure what I'm doing wrong this time. Any advice would be appreciated. Thanks so much.