run example/supervised/evolino/superimposed_sine.py error

[jt387]

Hi everyone! I run the example/supervised/evolino/superimposed_sine.py, but get the error below:

=== Learning to extrapolate 5 superimposed sine waves ===

creating training data
creating test data
creating EvolinoNetwork
creating EvolinoTrainer

====== NEXT RUN ======

=== TRAINING
Traceback (most recent call last):
File "superimposed_sine.py", line 89, in
trainer.trainEpochs( 1 )
File "/usr/local/UCS4/python/lib/python2.7/site-packages/PyBrain-0.3.1-py2.7.egg/pybrain/supervised/trainers/trainer.py", line 37, in trainEpochs
self.train(*args, **kwargs)
File "/usr/local/UCS4/python/lib/python2.7/site-packages/PyBrain-0.3.1-py2.7.egg/pybrain/supervised/trainers/evolino.py", line 130, in train
filter.apply(self._population)
File "/usr/local/UCS4/python/lib/python2.7/site-packages/PyBrain-0.3.1-py2.7.egg/pybrain/supervised/evolino/filter.py", line 115, in apply
fitness = self._evaluateNet(net, dataset, self.wtRatio)
File "/usr/local/UCS4/python/lib/python2.7/site-packages/PyBrain-0.3.1-py2.7.egg/pybrain/supervised/evolino/filter.py", line 57, in _evaluateNet
sequence = dataset.getSequence(i)[1]
File "/usr/local/UCS4/python/lib/python2.7/site-packages/PyBrain-0.3.1-py2.7.egg/pybrain/datasets/sequential.py", line 55, in getSequence
return [self._getSequenceField(index, l) for l in self.link]
File "/usr/local/UCS4/python/lib/python2.7/site-packages/PyBrain-0.3.1-py2.7.egg/pybrain/datasets/sequential.py", line 44, in _getSequenceField
return self.getField(field)[ravel(self.getField('sequence_index'))[index]:]
TypeError: slice indices must be integers or None or have an index method

How to fix it? Any reply will be appreciated, thanks!