lack of function in class 'PathOptimizer'

[thangckt]

Do anyone get this work?
I encounter the error as below, anyone can help?
It seem that, there is no function: 'binary_var_list()' in class 'PathOptimizer'
TIA,
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\path_optimizer.py in _run_time_init(self)
80 self.get_var_location()
81 var_num = int(np.sum(self.var_location))
---> 82 self.var = self.binary_var_list(var_num, name='x')
83 self.x = np.zeros([self.length, self.length])
84 self.x = self.x.astype('object')

AttributeError: 'PathOptimizer' object has no attribute 'binary_var_list'
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