TypeError: Fetch argument None has invalid type <class 'NoneType'>

[petteriTeikari]

Thanks for the nice skeleton repo @RobRomijnders :)

When I run your code off-the-shelf after the tf_upgrades to TF 1.xx I hit the following error:

Traceback (most recent call last):
  File "tsc_main.py", line 76, in <module>
    cost_val, summ,acc_val = sess.run([model.cost,model.merged,model.accuracy],feed_dict = {model.input: X_batch, model.labels: y_batch, model.keep_prob:1.0})
  File "/home/petteri/anaconda3/lib/python3.6/site-packages/tensorflow/python/client/session.py", line 767, in run
    run_metadata_ptr)
  File "/home/petteri/anaconda3/lib/python3.6/site-packages/tensorflow/python/client/session.py", line 952, in _run
    fetch_handler = _FetchHandler(self._graph, fetches, feed_dict_string)
  File "/home/petteri/anaconda3/lib/python3.6/site-packages/tensorflow/python/client/session.py", line 408, in __init__
    self._fetch_mapper = _FetchMapper.for_fetch(fetches)
  File "/home/petteri/anaconda3/lib/python3.6/site-packages/tensorflow/python/client/session.py", line 230, in for_fetch
    return _ListFetchMapper(fetch)
  File "/home/petteri/anaconda3/lib/python3.6/site-packages/tensorflow/python/client/session.py", line 337, in __init__
    self._mappers = [_FetchMapper.for_fetch(fetch) for fetch in fetches]
  File "/home/petteri/anaconda3/lib/python3.6/site-packages/tensorflow/python/client/session.py", line 337, in <listcomp>
    self._mappers = [_FetchMapper.for_fetch(fetch) for fetch in fetches]
  File "/home/petteri/anaconda3/lib/python3.6/site-packages/tensorflow/python/client/session.py", line 227, in for_fetch
    (fetch, type(fetch)))
TypeError: Fetch argument None has invalid type <class 'NoneType'>