Error on train phase

[mohammad228]

I have some pic with text file contain annotation tag of pictures.But when i start train phase, show me this error:
Traceback (most recent call last):
File "/home/girizliii/.local/bin/aocr", line 8, in
sys.exit(main())
File "/home/girizliii/.local/lib/python2.7/site-packages/aocr/main.py", line 257, in main
num_epoch=parameters.num_epoch
File "/home/girizliii/.local/lib/python2.7/site-packages/aocr/model/model.py", line 376, in train
for batch in s_gen.gen(self.batch_size):
File "/home/girizliii/.local/lib/python2.7/site-packages/aocr/util/data_gen.py", line 70, in gen
if self.max_width and (Image.open(IO(img)).size[0] <= self.max_width):
File "/usr/local/lib/python2.7/dist-packages/PIL/Image.py", line 2818, in open
raise IOError("cannot identify image file %r" % (filename if filename else fp))
IOError: cannot identify image file <StringIO.StringIO instance at 0x7fce59bf9280>

how i can solve this?
thanks