encounter problem when use API

[kaharjan]

I have trained Flatcat model according to Code Examples for using library interface the document.
it is trained by cmd command, and could segment by command line. But when I use API to load this model , there is problem. The code is the same as the in the document of Code Examples for using library interface . any idea what it happened ?

Thank you!

thuflatcat=thumorfess.thuflatcat("-model_file baseline.model.flatcat.tar.gz")
  File "__init__.py", line 86, in __init__
    self.model=self.io.read_binary_model_file(self.model_file)
  File "/usr/local/lib/python2.7/dist-packages/Morfessor-2.0.2alpha1-py2.7.egg/morfessor/io.py", line 176, in read_binary_model_file
    model = self.read_binary_file(file_name)
  File "/usr/local/lib/python2.7/dist-packages/Morfessor-2.0.2alpha1-py2.7.egg/morfessor/io.py", line 183, in read_binary_file
    obj = pickle.load(fobj)
cPickle.UnpicklingError: invalid load key, ''.