'ascii' codec can't decode byte 0xef in position 0: ordinal not in range(128)

[mynbo]

Traceback (most recent call last):
File "/home/byang/gnrt/tranX/exp.py", line 569, in
train(args)
File "/home/byang/gnrt/tranX/exp.py", line 47, in train
train_set = Dataset.from_bin_file(args.train_file)
File "/home/byang/gnrt/tranX/components/dataset.py", line 33, in from_bin_file
examples = pickle.load(open(file_path, 'rb'))
UnicodeDecodeError: 'ascii' codec can't decode byte 0xef in position 0: ordinal not in range(128)

Have any suggestions for this problem?
the datasets downloading from http://www.cs.cmu.edu/~pengchey/tranx.0.2.0.zip.
and the tranx.0.2.1.zip.

the above dataset both have the Error ."ascii' codec can't decode byte 0xef in position 0: ordinal not in range(128)"

[mynbo]

This error appear on all datasets except conala