Error! :(

[PierLucaLanzi]

I tried to run the example but I obtain this error:

root@f7776e04c7ef:/home/awari-deep/connect-four-tensorflow-master# python train.py --p1 minimax --p2 neural_network --iterations 200000 --randomness 0.1
Traceback (most recent call last):
File "train.py", line 8, in
import ai.factory
File "/home/awari-deep/connect-four-tensorflow-master/ai/factory.py", line 2, in
from neural_network.neural_network import NeuralNetwork
File "/home/awari-deep/connect-four-tensorflow-master/ai/neural_network/neural_network.py", line 24, in
x = tf.reshape(tf.concat(0,[x_p1, x_p2, x_empty]), [1, n_input])
File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/ops/array_ops.py", line 1122, in concat
tensor_shape.scalar())
File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/framework/tensor_shape.py", line 848, in assert_is_compatible_with
raise ValueError("Shapes %s and %s are incompatible" % (self, other))
ValueError: Shapes (3, 4, 4) and () are incompatible