Error:
Odoo Server Error

Traceback (most recent call last):
  File "/home/odoo/src/odoo/13.0/odoo/http.py", line 619, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/home/odoo/src/odoo/13.0/odoo/http.py", line 309, in _handle_exception
    raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
  File "/home/odoo/src/odoo/13.0/odoo/tools/pycompat.py", line 14, in reraise
    raise value
  File "/home/odoo/src/odoo/13.0/odoo/http.py", line 664, in dispatch
    result = self._call_function(**self.params)
  File "/home/odoo/src/odoo/13.0/odoo/http.py", line 345, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/home/odoo/src/odoo/13.0/odoo/service/model.py", line 93, in wrapper
    return f(dbname, *args, **kwargs)
  File "/home/odoo/src/odoo/13.0/odoo/http.py", line 338, in checked_call
    result = self.endpoint(*a, **kw)
  File "/home/odoo/src/odoo/13.0/odoo/http.py", line 910, in __call__
    return self.method(*args, **kw)
  File "/home/odoo/src/odoo/13.0/odoo/http.py", line 510, in response_wrap
    response = f(*args, **kw)
  File "/home/odoo/src/odoo/13.0/addons/web/controllers/main.py", line 1320, in call_kw
    return self._call_kw(model, method, args, kwargs)
  File "/home/odoo/src/odoo/13.0/addons/web/controllers/main.py", line 1312, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "/home/odoo/src/odoo/13.0/odoo/api.py", line 391, in call_kw
    result = _call_kw_model(method, model, args, kwargs)
  File "/home/odoo/src/odoo/13.0/odoo/api.py", line 364, in _call_kw_model
    result = method(recs, *args, **kwargs)
  File "/home/odoo/src/odoo/13.0/addons/web/models/models.py", line 75, in web_read_group
    expand_limit, expand_orderby)
  File "/home/odoo/src/odoo/13.0/addons/web/models/models.py", line 99, in _web_read_group
    orderby=orderby, lazy=lazy)
  File "/home/odoo/src/odoo/13.0/odoo/models.py", line 2131, in read_group
    result = self._read_group_raw(domain, fields, groupby, offset=offset, limit=limit, orderby=orderby, lazy=lazy)
  File "/home/odoo/src/odoo/13.0/odoo/models.py", line 2154, in _read_group_raw
    query = self._where_calc(domain)
  File "/home/odoo/src/odoo/13.0/odoo/models.py", line 4098, in _where_calc
    e = expression.expression(domain, self)
  File "/home/odoo/src/odoo/13.0/odoo/osv/expression.py", line 674, in __init__
    self.parse()
  File "/home/odoo/src/odoo/13.0/odoo/osv/expression.py", line 855, in parse
    raise ValueError("Invalid field %r in leaf %r" % (left, str(leaf)))
ValueError: Invalid field 'confirmation_date' in leaf "<osv.ExtendedLeaf: ('confirmation_date', '>=', '2020-01-01 08:00:00') on sale_order (ctx: )>"