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

Here is the code I've run:

def fish_model():
model = Sequential()
from keras.layers import Activation, Dense
from keras.layers.convolutional import Convolution2D
from keras.layers.convolutional import MaxPooling2D
from keras.layers import Dropout
model.add(Convolution2D(filters=(6,3,3),input_shape=(256,768,1),activation='relu'))
model.add(MaxPooling2D(pool_size=(2,2),strides=2))
model.add(Convolution2D(filters=6, nb_row=3, nb_col=3,subsample=(2,2),
input_shape=(256, 768, 1,), activation='relu', border_mode='same'))
model.add(Dropout(0.1))
model.add(Flatten())
model.add(Dense(8, activation='softmax'))
epochs = 5
lrate = 0.1
decay = lrate/epochs
#sgd = SGD(lr=lrate, momentum=0.5, decay=decay, nesterov=False)
model.compile(loss='categorical_crossentropy', optimizer='sgd', metrics=['categorical_accuracy'])
return model

model= fish_model()
print(model.summary())
history = model.fit(X_train, Y_train, validation_data=(x_validation, y_validation), nb_epoch=6, batch_size=4)


I am getting the following error:

Traceback (most recent call last)
<ipython-input-28-bf6be1e3ca4c> in <module>
----> 1 model= fish_model()
2 print(model.summary())
3 history = model.fit(X_train, Y_train, validation_data=(x_validation, y_validation), nb_epoch=6, batch_size=4)

<ipython-input-26-634ceb657d80> in fish_model()
23 from keras.layers.convolutional import MaxPooling2D
24 from keras.layers import Dropout
---> 25 model.add(Convolution2D(filters=(6,3,3),input_shape=(256,768,1),activation='relu'))
26 model.add(MaxPooling2D(pool_size=(2,2),strides=2))
27 model.add(Convolution2D(filters=6, nb_row=3, nb_col=3,subsample=(2,2),

~\Anaconda3\lib\site-packages\keras\legacy\interfaces.py in wrapper(*args, **kwargs)
89 warnings.warn('Update your `' + object_name + '` call to the ' +
90 'Keras 2 API: ' + signature, stacklevel=2)
---> 91 return func(*args, **kwargs)
92 wrapper._original_function = func
93 return wrapper

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


Why am I getting an error in Convolution2D? How can I fix the code?

In the code above I added 2 Convolution2D calls. When I try to make it in single line I'm getting the error.

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