«IpcoreAttributeException: обязательное свойство« xpos »не найдено в аргументах ключевых слов» инициализация.

Question

class Trench(Structure) :

        xpos = NumberProperty(required = True)

        def define_elements(self, elems):

                elems  += Rectangle(layer = Layer(4), center = (xpos+25,10), box_size = (2 , 20))
                elems  += Rectangle(layer = Layer(4), center = (xpos+17,16), box_size = (2 , 20))
                elems  += Rectangle(layer = Layer(4), center = (xpos+8,31), box_size = (20 , 2))
                elems  += Rectangle(layer = Layer(4), center = (xpos+14,23), box_size = (20 , 2))
                return elems


class ArrayOfTrenchs(Structure):

        xpos_1 = NumberProperty(required = True)

        no_of_xpos = PositiveNumberProperty(required = True)
        no_of_ypos= PositiveNumberProperty(required = True )
        origin = Coord2Property(required = True)

        def define_elements(self, elems):

                xp = Trench( xpos = self.xpos_1 )

                delta = 40
                elems += ARef(reference = xp, origin = self.origin, period = (delta,delta), n_o_periods = (self.no_of_xpos, self.no_of_ypos))
                return elems


A_1 = ArrayOfTrenchs(xpos_1= 10,no_of_xpos = 41, no_of_ypos = 6, origin = (15.0, 15.0))
A_1.write_gdsii("array_of_trench.gds")