AttributeError: 'list' object has no attribute 'startswith'

[DiyuanLu]

Exception in thread QueueRunnerThread-fifo_queue-fifo_queue_enqueue:
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 801, in __bootstrap_inner
self.run()
File "/usr/lib/python2.7/threading.py", line 754, in run
self.__target(*self.__args, **self.__kwargs)
File "load_audio_template.py", line 125, in _run
self.func(sess, enqueue_op) # call enqueue function
File "load_audio_template.py", line 72, in enqueue_func
data = func(sess.run(inputs))
File "load_audio_template.py", line 183, in get_audio_spectrograms
_spectrogram, _magnitude, _length = utils.get_spectrograms(_sound_file)
File "utils.py", line 40, in get_spectrograms
y, sr = librosa.load(sound_file, sr=hp.sr) # or set sr to hp.sr.
File "/home/elu/.local/lib/python2.7/site-packages/librosa/core/audio.py", line 107, in load
with audioread.audio_open(os.path.realpath(path)) as input_file:
File "/usr/lib/python2.7/posixpath.py", line 375, in realpath
path, ok = _joinrealpath('', filename, {})
File "/usr/lib/python2.7/posixpath.py", line 381, in _joinrealpath
if isabs(rest):
File "/usr/lib/python2.7/posixpath.py", line 54, in isabs
return s.startswith('/')
AttributeError: 'list' object has no attribute 'startswith'

I got this error when I run the load_data module.
Anyone knows how to solve this?