data_loader error(AssertionError)

[ZoeSnow]

When I ran data_loader.py ,I got the following error:(Does anyone know how to solve this error？Thank you!)

E:\Python3.5\python.exe C:/Users/Administrator/PycharmProjects/text-to-image/data_loader.py
[TL] Creating vocabulary.
Total words: 0
Words in vocabulary: 1
WARNING:tensorflow:From C:\Users\Administrator\PycharmProjects\text-to-image\tensorlayer\nlp.py:372: FastGFile.init (from tensorflow.python.platform.gfile) is deprecated and will be removed in a future version.
Instructions for updating:
Use tf.gfile.GFile.
Wrote vocabulary file: C:\Users\Administrator\PycharmProjects\text-to-image/vocab.txt
Traceback (most recent call last):
File "C:/Users/Administrator/PycharmProjects/text-to-image/data_loader.py", line 52, in
vocab = tl.nlp.Vocabulary(VOC_FIR, start_word="", end_word="", unk_word="")
File "C:\Users\Administrator\PycharmProjects\text-to-image\tensorlayer\nlp.py", line 244, in init
assert start_word in reverse_vocab
AssertionError
Process finished with exit code 1