An error about h5py cannot be solved

[ifmiracleshadasound]

input_ = hf['input']
File "h5py/_objects.pyx", line 54, in h5py._objects.with_phil.wrapper (/tmp/pip-tnf92dft-build/h5py/_objects.c:2853)
File "h5py/_objects.pyx", line 55, in h5py._objects.with_phil.wrapper (/tmp/pip-tnf92dft-build/h5py/_objects.c:2811)
File "/usr/local/lib/python3.6/dist-packages/h5py/_hl/group.py", line 166, in getitem
oid = h5o.open(self.id, self._e(name), lapl=self._lapl)
File "h5py/_objects.pyx", line 54, in h5py._objects.with_phil.wrapper (/tmp/pip-tnf92dft-build/h5py/_objects.c:2853)
File "h5py/_objects.pyx", line 55, in h5py._objects.with_phil.wrapper (/tmp/pip-tnf92dft-build/h5py/_objects.c:2811)
File "h5py/h5o.pyx", line 190, in h5py.h5o.open (/tmp/pip-tnf92dft-build/h5py/h5o.c:3739)
KeyError: "Unable to open object (Object 'input' doesn't exist)"

What should I do?