how to solve this error in linux server while using neuralprophet

[adityamoglade]

Last login: Sat Jun 3 13:37:08 2023 from 49.36.184.117
ubuntu@ip-172-31-2-52:~$ screen -dr marketdata
File "/usr/local/lib/python3.10/dist-packages/pytorch_lightning/loops/optimization/manual_loop.py", line 110, in advance
training_step_output = self.trainer._call_strategy_hook("training_step", *kwargs.values())
File "/usr/local/lib/python3.10/dist-packages/pytorch_lightning/trainer/trainer.py", line 1494, in _call_strategy_hook
output = fn(*args, **kwargs)
File "/usr/local/lib/python3.10/dist-packages/pytorch_lightning/strategies/strategy.py", line 378, in training_step
return self.model.training_step(*args, **kwargs)
File "/usr/local/lib/python3.10/dist-packages/neuralprophet/time_net.py", line 791, in training_step
self.log_dict(self.metrics_train(predicted_denorm, target_denorm), **self.log_args)
File "/usr/local/lib/python3.10/dist-packages/pytorch_lightning/core/module.py", line 583, in log_dict
self.log(
File "/usr/local/lib/python3.10/dist-packages/pytorch_lightning/core/module.py", line 422, in log
apply_to_collection(
File "/usr/local/lib/python3.10/dist-packages/lightning_utilities/core/apply_func.py", line 51, in apply_to_collection
return function(data, *args, **kwargs)
File "/usr/local/lib/python3.10/dist-packages/pytorch_lightning/core/module.py", line 621, in __check_allowed
raise ValueError(f"self.log({name}, {value}) was called, but {type(v)._name_} values cannot be logged")
ValueError: self.log(MAE, None) was called, but NoneType values cannot be logged

sometimes i had
ValueError: self.log(RMSE, None) was called, but NoneType values cannot be logged

please give me solution