Error in week 1 assignment 2 exercise 2

here is the error attached

ypeError                                 Traceback (most recent call last)
<ipython-input-115-f1284300b767> in <module>
----> 1 conv_model = convolutional_model((64, 64, 3))
      2 conv_model.compile(optimizer='adam',
      3                   loss='categorical_crossentropy',
      4                   metrics=['accuracy'])
      5 conv_model.summary()

<ipython-input-114-e6f7812d9401> in convolutional_model(input_shape)
     38 
     39     tf.keras.layers.Conv2D(8,(4,4),strides=1,padding = 'same',input_shape=[input_img]),
---> 40     Z1=tf.keras.layers.Conv2D(input_img)
     41     tfl.ReLU(),
     42     A1 = tf.keras.layers.ReLU()(Z1)

TypeError: __init__() missing 1 required positional argument: 'kernel_size'

Your line 40 is a second call to Conv2D. That seems wrong.
And, in the Function API, your lines of code don’t need to end in commas.
And, your line 41 is not needed, because you called the ReLU layer in line 42.

I got the error thankyou for the assistance