При передаче функции готового списка - получаю ошибку TypeError: 'list' object is not callable

def Grad(self, a_SummErrors):
        The_dXdW = self.dXdW()
        return [[[a_SummErrors[j][t] * The_dXdW[k][j] for t in range(len(a_SummErrors[0]))] for k in range(len(The_dXdW))] for j in range(len(self.W[-1][0]))]

a_SummErrors = [[0.8041911558591874, -0.6958669419573823, 1.1503880874498995, 0.8680363858712403]]
def Grad(self, a_SummErrors):
        The_dXdW = [[0.5351148079264522],
 [0.5351148079264522],
 [0.5351148079264522],
 [-0.5351148079264522]]
        return [[[a_SummErrors[j][t] * The_dXdW[k][j] for t in range(len(a_SummErrors[0]))] for k in range(len(The_dXdW))] for j in range(len(np.array([0.01140246])))]

class Initial_Data():
    
    def __init__(self, first_layer_perc, arrX, arrY=None):
        self.layer_perc = first_layer_perc
        self.arrX = [1] + arrX
        self.arrY = arrY
        self.W = []
        self.Grad = [[[[0 for row in range(self.layer_perc)] for j in range(len(self.arrX))] for i in range(self.layer_perc)]]
        
        
    def Grad(self, a_SummErrors):
        The_dXdW = self.dXdW()
        return [[[a_SummErrors[j][t] * The_dXdW[k][j] for t in range(len(a_SummErrors[0]))] for k in range(len(The_dXdW))] for j in range(len(self.W[-1][0]))]