I have sales order automatically created by the Website Store and sales orders created manually. Those that are manually created I can validate and create invoice, but those that are automatically created it gives me an error when I try to create an Invoice. Here is the error:

Odoo Server Error

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 656, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 314, in _handle_exception
    raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
  File "/usr/lib/python3/dist-packages/odoo/tools/pycompat.py", line 87, in reraise
    raise value
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 698, in dispatch
    result = self._call_function(**self.params)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 346, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/odoo/service/model.py", line 98, in wrapper
    return f(dbname, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 339, in checked_call
    result = self.endpoint(*a, **kw)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 941, in __call__
    return self.method(*args, **kw)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 519, in response_wrap
    response = f(*args, **kw)
  File "/usr/lib/python3/dist-packages/odoo/addons/web/controllers/main.py", line 966, in call_button
    action = self._call_kw(model, method, args, {})
  File "/usr/lib/python3/dist-packages/odoo/addons/web/controllers/main.py", line 954, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "/usr/lib/python3/dist-packages/odoo/api.py", line 759, in call_kw
    return _call_kw_multi(method, model, args, kwargs)
  File "/usr/lib/python3/dist-packages/odoo/api.py", line 746, in _call_kw_multi
    result = method(recs, *args, **kwargs)
  File "/home/addons/V12/stock_picking_delivery_info_computation/models/sale_order.py", line 11, in action_confirm
    res = super(SaleOrder, self).action_confirm()
  File "/home/addons/V12/sale_order_automation/models/sale_order.py", line 30, in action_confirm
    order.action_invoice_create()
  File "/usr/lib/python3/dist-packages/odoo/addons/sale/models/sale.py", line 581, in action_invoice_create
    invoice = inv_obj.create(inv_data)
  File "<decorator-gen-276>", line 2, in create
  File "/usr/lib/python3/dist-packages/odoo/api.py", line 440, in _model_create_single
    return create(self, arg)
  File "/usr/lib/python3/dist-packages/odoo/addons/purchase/models/account_invoice.py", line 160, in create
    invoice = super(AccountInvoice, self).create(vals)
  File "<decorator-gen-233>", line 2, in create
  File "/usr/lib/python3/dist-packages/odoo/api.py", line 440, in _model_create_single
    return create(self, arg)
  File "/usr/lib/python3/dist-packages/odoo/addons/account/models/account_invoice.py", line 557, in create
    invoice = super(AccountInvoice, self.with_context(mail_create_nolog=True)).create(vals)
  File "<decorator-gen-127>", line 2, in create
  File "/usr/lib/python3/dist-packages/odoo/api.py", line 461, in _model_create_multi
    return create(self, [arg])
  File "/usr/lib/python3/dist-packages/odoo/addons/mail/models/mail_thread.py", line 286, in create
    thread._message_auto_subscribe(create_values)
  File "/usr/lib/python3/dist-packages/odoo/addons/mail/models/mail_thread.py", line 2449, in _message_auto_subscribe
    self.with_context(lang=lang)._message_auto_subscribe_notify(pids, template)
TypeError: _message_auto_subscribe_notify() takes 2 positional arguments but 3 were given

I tried commenting this line in the Odoo source code but it still gives me the same error at the same line showing the commented line. Which doesn't make sense to me. Can anyone help me with this issue?