2021-08-05 03:10:38,052 - uipath_core.trainer_run:main:66 - INFO:  Starting training job...
2021-08-05 03:10:40,098 - uipath_core.storage.azure_storage_client:download:95 - INFO:  Dataset from bucket folder training-f956c259-f841-430c-a617-f58910406d09/6142c0b0-294b-4f56-9279-447dcc7d234a/b905fe7d-117e-49a0-8d1b-e50f036ebaeb with size 2 downloaded successfully
2021-08-05 03:10:40,099 - uipath_core.training_plugin:download_dataset:409 - WARNING:  Deleting already existing folder name: /data/dataset/test
2021-08-05 03:10:40,253 - uipath_core.storage.azure_storage_client:download:95 - INFO:  Dataset from bucket folder training-f956c259-f841-430c-a617-f58910406d09/6142c0b0-294b-4f56-9279-447dcc7d234a/13aee404-c382-451a-9dc9-7a18f44e955e with size 1 downloaded successfully
2021-08-05 03:10:40,254 - uipath_core.training_plugin:process_data_model:121 - INFO:  Start process model data...
2021-08-05 03:10:40,254 - uipath_core.training_plugin:initialize_model:103 - INFO:  Start model initialization...
2021-08-05 03:10:40,255 - uipath_core.training_plugin:initialize_model:106 - INFO:  Model initialized successfully
2021-08-05 03:10:40,256 - root:preprocess_data:135 - INFO:   Reading train1.txt ..
2021-08-05 03:10:43,173 - root:preprocess_data:135 - INFO:   Reading train2.txt ..
2021-08-05 03:10:45,414 - root:preprocess_data:149 - INFO:  Reading from test directory
2021-08-05 03:10:45,585 - uipath_core.training_plugin:process_data:425 - ERROR:  Failed to process data, error: No objects to concatenate
2021-08-05 03:10:45,585 - uipath_core.training_plugin:model_run:145 - ERROR:  Training failed for pipeline type: FULL_TRAINING, error: No objects to concatenate
2021-08-05 03:10:45,637 - uipath_core.trainer_run:main:81 - ERROR:  Training Job failed, error: No objects to concatenate
Traceback (most recent call last):
  File "/home/aifabric/.local/lib/python3.8/site-packages/uipath_core/trainer_run.py", line 76, in main
    wrapper.run()
  File "/microservice/training_wrapper.py", line 57, in run
    return self.training_plugin.model_run()
  File "/home/aifabric/.local/lib/python3.8/site-packages/uipath_core/training_plugin.py", line 146, in model_run
    raise e
  File "/home/aifabric/.local/lib/python3.8/site-packages/uipath_core/training_plugin.py", line 134, in model_run
    self.run_full_training()
  File "/home/aifabric/.local/lib/python3.8/site-packages/uipath_core/training_plugin.py", line 164, in run_full_training
    self.process_data()
  File "/home/aifabric/.local/lib/python3.8/site-packages/uipath_core/training_plugin.py", line 426, in process_data
    raise e
  File "/home/aifabric/.local/lib/python3.8/site-packages/uipath_core/training_plugin.py", line 423, in process_data
    self.process_data_model(self.local_dataset_directory)
  File "/home/aifabric/.local/lib/python3.8/site-packages/uipath_core/training_plugin.py", line 122, in process_data_model
    self.model.process_data(directory)
  File "/microservice/train.py", line 59, in process_data
    self.df_train, self.df_test = preprocess.preprocess_data(self.opt)
  File "<frozen aicenter.ner.preprocess>", line 157, in preprocess_data
  File "/home/aifabric/.local/lib/python3.8/site-packages/pandas/util/_decorators.py", line 311, in wrapper
    return func(*args, **kwargs)
  File "/home/aifabric/.local/lib/python3.8/site-packages/pandas/core/reshape/concat.py", line 294, in concat
    op = _Concatenator(
  File "/home/aifabric/.local/lib/python3.8/site-packages/pandas/core/reshape/concat.py", line 351, in __init__
    raise ValueError("No objects to concatenate")
ValueError: No objects to concatenate