Hi, i have this problem with this code that worked in past versions of Odoo:

The objetive is take the sale's date and create visitthe objective is to take the sale date and create a plan for automatic visits, 2 visits per year for three years

class garantias(models.Model):

    _name = 'itriplee.garantias'

    _rec_name = 'folio'


    folio = fields.Integer('Folio', required=True)

    cliente = fields.Many2one('res.partner', 'Cliente')

    equipo = fields.Many2one('itriplee.equipos', 'Equipo')

    serie  = fields.Char('Numero de Serie', related='equipo.name', readonly=True)

    factura = fields.Char('Numero de Factura', related='equipo.factura', readonly=True)

    modelo = fields.Char('Modelo', related='equipo.modelo.name', readonly=True)

    marca = fields.Char('Marca', related='equipo.marca', readonly=True)

    tipo = fields.Char('Tipo', related='equipo.tipo', readonly=True)

    fecha_de_venta = fields.Date('Fecha de Venta', related='equipo.venta', readonly=True)

    visitas = fields.One2many('itriplee.servicio', 'garantia_asociada', 'Visitas')

    observaciones = fields.Text('Observaciones')

    valoracion = fields.Text('Valoración para Poliza')



    @api.model

    def create(self, vals):

        obj_visita = self.pool.get('itriplee.servicio')

        obj = self.env['itriplee.garantias']

        cliente = obj.cliente.id

        fecha_compra = obj.equipo.venta

        fm = ('%Y-%m-%d')

        cantidad_meses = 6

        ind = 0

        now = datetime.now()

        now_str = now.strftime(fm)

        now_int = datetime.strptime(now_str, fm)

        # fecha_compra_original = datetime.strptime(fecha_compra, fm)

        fecha_compra_inicial = datetime.strptime(fecha_compra, fm)

        while ind < cantidad_meses:

            fecha_6_meses = fecha_compra_inicial + relativedelta(months=6)

            if fecha_6_meses >= now_int:

                obj_visita.create({'cliente':cliente,'visita':fecha_6_meses,'estado':'confirmar','visitas':obj.id},context=None)

            ind = ind + 1

            fecha_compra_inicial = fecha_6_meses

        return True

And that gave me this error:

Traceback (most recent call last):
  File "/home/openerp/odoo-dev/odoo/odoo/http.py", line 651, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/home/openerp/odoo-dev/odoo/odoo/http.py", line 310, in _handle_exception
    raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
  File "/home/openerp/odoo-dev/odoo/odoo/tools/pycompat.py", line 87, in reraise
    raise value
  File "/home/openerp/odoo-dev/odoo/odoo/http.py", line 693, in dispatch
    result = self._call_function(**self.params)
  File "/home/openerp/odoo-dev/odoo/odoo/http.py", line 342, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/home/openerp/odoo-dev/odoo/odoo/service/model.py", line 97, in wrapper
    return f(dbname, *args, **kwargs)
  File "/home/openerp/odoo-dev/odoo/odoo/http.py", line 335, in checked_call
    result = self.endpoint(*a, **kw)
  File "/home/openerp/odoo-dev/odoo/odoo/http.py", line 937, in __call__
    return self.method(*args, **kw)
  File "/home/openerp/odoo-dev/odoo/odoo/http.py", line 515, in response_wrap
    response = f(*args, **kw)
  File "/home/openerp/odoo-dev/odoo/addons/web/controllers/main.py", line 934, in call_kw
    return self._call_kw(model, method, args, kwargs)
  File "/home/openerp/odoo-dev/odoo/addons/web/controllers/main.py", line 926, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "/home/openerp/odoo-dev/odoo/odoo/api.py", line 687, in call_kw
    return call_kw_model(method, model, args, kwargs)
  File "/home/openerp/odoo-dev/odoo/odoo/api.py", line 672, in call_kw_model
    result = method(recs, *args, **kwargs)
  File "/home/openerp/odoo-dev/odoo/addons/itriplee/models/garantias.py", line 83, in create
    fecha_compra_inicial = datetime.strptime(fecha_compra, fm)
TypeError: strptime() argument 1 must be str, not bool

i don't get it, can you help me?