source=conv1_layer, target=pool1_layer, kernel_size=2, stride=2 TypeError: Can't instantiate abstract class SpatialPooling2dConnection with abstract methods reset_state_variables

[tehreemnaqvi]

Hi,
I just started to follow you code which is multilayer_conv_mnist ,when I run this code. got this error:
source=conv1_layer, target=pool1_layer, kernel_size=2, stride=2
TypeError: Can't instantiate abstract class SpatialPooling2dConnection with abstract methods reset_state_variables

Can you please tell how can I fix this issue?
Thanks