this kind of error module' object is not callable while building CNN

from tensorflow.keras.layers import Dense
keras.models.sequential([
    keras.layers.Conv2D(filters=32,kernel_size=3, strides=(2,2),padding="valid",activation='relu',input_shape=[28, 28,1]),
    keras.layers.MaxPooling2D(pool_size=(2,2)),
    keras.layers.Flatten(),
    keras.layers.Dense(units=128,activation='relu'),
    keras.layers.Dense(units=10,activation='softmax')               
])