I go this following error when I click a button on my custom addons:

Error:
Odoo Server Error
Traceback (most recent call last):
  File "/opt/odoo/odoo12/odoo/http.py", line 656, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/opt/odoo/odoo12/odoo/http.py", line 314, in _handle_exception
    raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
  File "/opt/odoo/odoo12/odoo/tools/pycompat.py", line 87, in reraise
    raise value
  File "/opt/odoo/odoo12/odoo/http.py", line 698, in dispatch
    result = self._call_function(**self.params)
  File "/opt/odoo/odoo12/odoo/http.py", line 346, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/opt/odoo/odoo12/odoo/service/model.py", line 97, in wrapper
    return f(dbname, *args, **kwargs)
  File "/opt/odoo/odoo12/odoo/http.py", line 339, in checked_call
    result = self.endpoint(*a, **kw)
  File "/opt/odoo/odoo12/odoo/http.py", line 941, in __call__
    return self.method(*args, **kw)
  File "/opt/odoo/odoo12/odoo/http.py", line 519, in response_wrap
    response = f(*args, **kw)
TypeError: load() missing 1 required positional argument: 'action_id'

So, what should I fix for this..?

UPDATE: Add code.

Here is my models.py

from odoo import api, fields, models, _
import time
from odoo.exceptions import UserError
import logging

_logger = logging.getLogger(__name__)


class invoice(models.Model):
    _name = 'account.invoice'
    _inherit = 'account.invoice'

    printer_data = fields.Text(string="Printer Data", required=False)

    @api.multi
    def generate_printer_data(self):
        tpl = self.env['mail.template'].search([('name', '=', 'Dot Matrix Invoice')])
        data = tpl._render_template(tpl.body_html, 'account.invoice', self.id, post_process=False)
        self.printer_data = data

    @api.multi
    def action_invoice_cancel(self):
        self.printer_data = ''
        return super(invoice, self).action_cancel()

    @api.multi
    def action_invoice_open(self):
        res = super(invoice, self).action_invoice_open()
        self.generate_printer_data()
        return res

And here is my invoice.xml where the button I click got that error.

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <record id="view_dotmatrix_invoice" model="ir.ui.view">
        <field name="name">view_dotmatrix_invoice</field>
        <field name="model">account.invoice</field>
        <field name="inherit_id" ref="account.invoice_form"/>
        <field name="arch" type="xml">
            <header position="inside">
                # I got error when I click this button bellow
                <button type="action" string="Dot Matrix" icon="fa-print" custom="print"/>
            </header>

            <notebook position="inside">
                <page string="Dot Matrix">
                    <button string="Refresh Printer Data" icon="fa-print" states="open" type="object" name="generate_printer_data"/>
                    <pre>
                        <field name="printer_data"/>
                    </pre>
                </page>
            </notebook>
        </field>
    </record>
</odoo>

and here is the print_button.js

odoo.define('vit_dotmatrix.print_button', function (require) {
    'use strict';

    var form_widget = require('web.form_widgets');
    var core = require('web.core');

    var QWeb = core.qweb;
    var _t = core._t;


    form_widget.WidgetButton.include({
        on_click: function() {
            if(this.node.attrs.custom === "print" ){
                console.log("print triggered");
                var url = "http://localhost/dotmatrix/print.php";

                var view = this.getParent();
                var printer_data = view.datarecord.printer_data;
                if (!printer_data){
                    alert('No data to print. Please click Update Printer Data');
                    return;
                }
                // code ajax printer
                console.log(printer_data);

                $.ajax({
                    method : "POST",
                    url: url,
                    data: {
                        printer_data: printer_data
                    },
                    success: function(data){
                        console.log('Success');
                        console.log(data);
                    },
                    error: function(data){
                        console.log('Failed');
                        console.log(data);
                    },
                });
            }
            else{
                this._super();
            }
        }
    });
});

That is three related code from my addons.