google.protobuf.text_format.ParseError: 8:5 : Message type "second.protos.VoxelNet" has no field named "num_class".

[gdb123]

您好，我在训练过程中遇到下面问题，您可以帮忙解决么？
Traceback (most recent call last):
File "./pytorch/train.py", line 765, in
fire.Fire()
File "/anaconda3/envs/tanet/lib/python3.7/site-packages/fire/core.py", line 141, in Fire
component_trace = _Fire(component, args, parsed_flag_args, context, name)
File "/anaconda3/envs/tanet/lib/python3.7/site-packages/fire/core.py", line 480, in _Fire
target=component.name)
File "/anaconda3/envs/tanet/lib/python3.7/site-packages/fire/core.py", line 691, in _CallAndUpdateTrace
component = fn(*varargs, **kwargs)
File "./pytorch/train.py", line 112, in train
text_format.Merge(proto_str, config)
File "/anaconda3/envs/tanet/lib/python3.7/site-packages/google/protobuf/text_format.py", line 728, in Merge
allow_unknown_field=allow_unknown_field)
File "/anaconda3/envs/tanet/lib/python3.7/site-packages/google/protobuf/text_format.py", line 796, in MergeLines
return parser.MergeLines(lines, message)
File "/anaconda3/envs/tanet/lib/python3.7/site-packages/google/protobuf/text_format.py", line 821, in MergeLines
self._ParseOrMerge(lines, message)
File "/anaconda3/envs/tanet/lib/python3.7/site-packages/google/protobuf/text_format.py", line 840, in _ParseOrMerge
self._MergeField(tokenizer, message)
File "/anaconda3/envs/tanet/lib/python3.7/site-packages/google/protobuf/text_format.py", line 970, in _MergeField
merger(tokenizer, message, field)
File "/anaconda3/envs/tanet/lib/python3.7/site-packages/google/protobuf/text_format.py", line 1045, in _MergeMessageField
self._MergeField(tokenizer, sub_message)
File "/anaconda3/envs/tanet/lib/python3.7/site-packages/google/protobuf/text_format.py", line 970, in _MergeField
merger(tokenizer, message, field)
File "/anaconda3/envs/tanet/lib/python3.7/site-packages/google/protobuf/text_format.py", line 1045, in _MergeMessageField
self._MergeField(tokenizer, sub_message)
File "/anaconda3/envs/tanet/lib/python3.7/site-packages/google/protobuf/text_format.py", line 937, in _MergeField
(message_descriptor.full_name, name))
google.protobuf.text_format.ParseError: 8:5 : Message type "second.protos.VoxelNet" has no field named "num_class".