请问一下保存的时候出现这种情况是怎么回事怎么解决

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Starting. Press "Enter" to stop training and save model.
H:\DeepFaceLab_NVIDIA_up_to_RTX2080Ti\_internal\python-3.6.8\lib\site-packages\numpy\core\fromnumeric.py:3373: RuntimeWarning: Mean of empty slice.
  out=out, **kwargs)
H:\DeepFaceLab_NVIDIA_up_to_RTX2080Ti\_internal\python-3.6.8\lib\site-packages\numpy\core\_methods.py:170: RuntimeWarning: invalid value encountered in double_scalars
  ret = ret.dtype.type(ret / rcount)
Error: 'numpy.float64' object is not iterable
Traceback (most recent call last):
  File "H:\DeepFaceLab_NVIDIA_up_to_RTX2080Ti\_internal\DeepFaceLab\mainscripts\Trainer.py", line 143, in trainerThread
    for loss_value in mean_loss:TypeError: 'numpy.float64' object is not iterable