MultiRNNCell error about handson-ml HOT 5 CLOSED

>>> import tensorflow as tf
>>> cell = tf.contrib.rnn.BasicRNNCell(num_units=100)
>>> multi_layer_cell = tf.contrib.rnn.MultiRNNCell([cell]*3)
>>> X = tf.placeholder(tf.float32, [None, 20, 10])
>>> outputs, states = tf.nn.dynamic_rnn(multi_layer_cell, X, dtype=tf.float32)
>>> 

>>> import tensorflow as tf
>>> cell = tf.contrib.rnn.BasicRNNCell(num_units=100)
>>> multi_layer_cell = tf.contrib.rnn.MultiRNNCell([cell]*3)
>>> X = tf.placeholder(tf.float32, [None, 20, 10])
>>> outputs, states = tf.nn.dynamic_rnn(multi_layer_cell, X, dtype=tf.float32)
Traceback (most recent call last):
[...]
  File "/home/ageron/dev/py/envs/ml/lib/python3.5/site-packages/tensorflow/contrib/rnn/python/ops/core_rnn_cell_impl.py", line 77, in _checked_scope
    type(cell).__name__))
ValueError: Attempt to reuse RNNCell <tensorflow.contrib.rnn.python.ops.core_rnn_cell_impl.BasicRNNCell object at 0x7f5887f9cc18> with a different variable scope than its first use.  First use of cell was with scope 'rnn/multi_rnn_cell/cell_0/basic_rnn_cell', this attempt is with scope 'rnn/multi_rnn_cell/cell_1/basic_rnn_cell'.  Please create a new instance of the cell if you would like it to use a different set of weights.  If before you were using: MultiRNNCell([BasicRNNCell(...)] * num_layers), change to: MultiRNNCell([BasicRNNCell(...) for _ in range(num_layers)]).  If before you were using the same cell instance as both the forward and reverse cell of a bidirectional RNN, simply create two instances (one for forward, one for reverse).  In May 2017, we will start transitioning this cell's behavior to use existing stored weights, if any, when it is called with scope=None (which can lead to silent model degradation, so this error will remain until then.)
>>> 

>>> import tensorflow as tf
>>> cells = [tf.contrib.rnn.BasicRNNCell(num_units=100) for layer in range(3)]
>>> multi_layer_cell = tf.contrib.rnn.MultiRNNCell(cells)
>>> X = tf.placeholder(tf.float32, [None, 20, 10])
>>> outputs, states = tf.nn.dynamic_rnn(multi_layer_cell, X, dtype=tf.float32)
>>>