Error running train.py from lstm_object_detetcion

Getting this following error while running train.py from lstm_object_detection.

Traceback (most recent call last):
File "lstm_object_detection/train.py", line 185, in
tf.app.run()
File "/home/kt-ml1/.local/lib/python3.6/site-packages/tensorflow/python/platform/app.py", line 125, in run
_sys.exit(main(argv))
File "lstm_object_detection/train.py", line 94, in main
FLAGS.pipeline_config_path)
File "/home/kt-ml1/models-master/models-master/research/lstm_object_detection/utils/config_util.py", line 46, in get_configs_from_pipeline_file
text_format.Merge(proto_str, pipeline_config)
File "/home/kt-ml1/.local/lib/python3.6/site-packages/google/protobuf/text_format.py", line 574, in Merge
descriptor_pool=descriptor_pool)
File "/home/kt-ml1/.local/lib/python3.6/site-packages/google/protobuf/text_format.py", line 631, in MergeLines
return parser.MergeLines(lines, message)
File "/home/kt-ml1/.local/lib/python3.6/site-packages/google/protobuf/text_format.py", line 654, in MergeLines
self._ParseOrMerge(lines, message)
File "/home/kt-ml1/.local/lib/python3.6/site-packages/google/protobuf/text_format.py", line 676, in _ParseOrMerge
self._MergeField(tokenizer, message)
File "/home/kt-ml1/.local/lib/python3.6/site-packages/google/protobuf/text_format.py", line 735, in _MergeField
'that message's _pb2 module must be imported as well' % name)
google.protobuf.text_format.ParseError: 18:26 : Extension "object_detection.protos.lstm_model" not registered. Did you import the _pb2 module which defines it? If you are trying to place the extension in the MessageSet field of another message that is in an Any or MessageSet field, that message's _pb2 module must be imported as well