
Traceback (most recent call last):


 "/Users/4d/anaconda/lib/python3.6/site-packages/conda/exceptions.py", line 632, in conda_exception_handler

return_value = func(*args, **kwargs)


 "/Users/4d/anaconda/lib/python3.6/site-packages/conda_env/cli/main_create.py", line 108, in execute

installer.install(prefix, pkg_specs, args, env)


 "/Users/4d/anaconda/lib/python3.6/site-packages/conda_env/installers/pip.py", line 8, in install

pip_cmd = pip_args(prefix) + ['install', ] + specs

TypeError: can only concatenate list (not "NoneType") to list

Traceback (most recent call last):


 "/home/martongyorgy/projects/tmp/transformers/examples/seq2seq/finetune.py", line 364, in <module>

xsum_rouge.json


 "/home/martongyorgy/projects/tmp/transformers/examples/seq2seq/finetune.py", line 342, in main

logger=logger,


 "/home/martongyorgy/projects/tmp/transformers/examples/lightning_base.py", line 330, in generic_train

trainer.fit(model)


 "/home/martongyorgy/miniconda3/envs/transformers/lib/python3.7/site-packages/pytorch_lightning/trainer/trainer.py", line 891, in fit

self.ddp_train(task, model)


 "/home/martongyorgy/miniconda3/envs/transformers/lib/python3.7/site-packages/pytorch_lightning/trainer/distrib_data_parallel.py", line 530, in ddp_train

self.run_pretrain_routine(model)


 "/home/martongyorgy/miniconda3/envs/transformers/lib/python3.7/site-packages/pytorch_lightning/trainer/trainer.py", line 1046, in run_pretrain_routine

self.configure_checkpoint_callback()


 "/home/martongyorgy/miniconda3/envs/transformers/lib/python3.7/site-packages/pytorch_lightning/trainer/callback_config.py", line 60, in configure_checkpoint_callback

"checkpoints"


 "/home/martongyorgy/miniconda3/envs/transformers/lib/python3.7/posixpath.py", line 94, in join

genericpath._check_arg_types('join', a, *p)


 "/home/martongyorgy/miniconda3/envs/transformers/lib/python3.7/genericpath.py", line 153, in _check_arg_types

(funcname, s.__class__.__name__)) from None
TypeError: join() argument must be str or bytes, not 'NoneType'
