python example error

[Duanexiao]

clf.fit(x_train, y_train, test_data=[(x_test, y_test)])
Traceback (most recent call last):
File "", line 1, in
File "/home/apps/duane_tmp/anaconda2/lib/python2.7/site-packages/pylightgbm/models.py", line 131, in fit
stdout=subprocess.PIPE, bufsize=1)
File "/home/apps/duane_tmp/anaconda2/lib/python2.7/subprocess.py", line 711, in init
errread, errwrite)
File "/home/apps/duane_tmp/anaconda2/lib/python2.7/subprocess.py", line 1343, in _execute_child
raise child_exception
OSError: [Errno 2] No such file or directory

hello,when try the python example at clf.fit(x_train, y_train, test_data=[(x_test, y_test)]) this line,it response me that above error.could you help me fix that?tks!