When I try to Validate Closing and Post Entries I get the following error:

Error:

Odoo Server Error

Traceback (most recent call last):

File "/home/odoo/src/odoo/saas-14/odoo/http.py", line 640, in _handle_exception

return super(JsonRequest, self)._handle_exception(exception)

File "/home/odoo/src/odoo/saas-14/odoo/http.py", line 677, in dispatch

result = self._call_function(**self.params)

File "/home/odoo/src/odoo/saas-14/odoo/http.py", line 333, in _call_function

return checked_call(self.db, *args, **kwargs)

File "/home/odoo/src/odoo/saas-14/odoo/service/model.py", line 101, in wrapper

return f(dbname, *args, **kwargs)

File "/home/odoo/src/odoo/saas-14/odoo/http.py", line 326, in checked_call

result = self.endpoint(*a, **kw)

File "/home/odoo/src/odoo/saas-14/odoo/http.py", line 935, in __call__

return self.method(*args, **kw)

File "/home/odoo/src/odoo/saas-14/odoo/http.py", line 506, in response_wrap

response = f(*args, **kw)

File "/home/odoo/src/odoo/saas-14/addons/web/controllers/main.py", line 900, in call_button

action = self._call_kw(model, method, args, {})

File "/home/odoo/src/odoo/saas-14/addons/web/controllers/main.py", line 888, in _call_kw

return call_kw(request.env[model], method, args, kwargs)

File "/home/odoo/src/odoo/saas-14/odoo/api.py", line 689, in call_kw

return call_kw_multi(method, model, args, kwargs)

File "/home/odoo/src/odoo/saas-14/odoo/api.py", line 680, in call_kw_multi

result = method(recs, *args, **kwargs)

File "/home/odoo/src/odoo/saas-14/addons/point_of_sale/models/pos_session.py", line 258, in action_pos_session_validate

self.action_pos_session_close()

File "/home/odoo/src/odoo/saas-14/addons/point_of_sale/models/pos_session.py", line 274, in action_pos_session_close

self.with_context(ctx)._confirm_orders()

File "/home/odoo/src/odoo/saas-14/addons/point_of_sale/models/pos_session.py", line 28, in _confirm_orders

move = self.env['pos.order'].with_context(force_company=company_id)._create_account_move(session.start_at, session.name, int(journal_id), company_id)

File "/home/odoo/src/odoo/saas-14/addons/point_of_sale/models/pos_order.py", line 152, in _create_account_move

date_tz_user = fields.Datetime.context_timestamp(self, fields.Datetime.from_string(dt))

File "/home/odoo/src/odoo/saas-14/odoo/fields.py", line 1579, in context_timestamp

assert isinstance(timestamp, datetime), 'Datetime instance expected'

AssertionError: Datetime instance expected

I can't also delete the session which would be fine by me.

Odoo V10