Language pair issue while running the code

[faysalhossain2007]

I use the following code to run the model.

$ python fairseq-context/train.py --use-context --fp16 --save-dir target_dir/model --arch fconv_context --distributed-world-size 1 --encoder-embed-dim 250 --decoder-embed-dim 250 --decoder-out-embed-dim 250 --encoder-layers '[(256,3)] * 7' --decoder-layers '[(256,3)] * 7' --dropout 0.2 --clip-norm 0.1 --lr 0.25 --min-lr 1e-4 --momentum 0.99 --max-epoch 1 --batch-size 32 target_dir/bin

But after a few second the program faces the following issue. Did anyone else face the same issue before?

Traceback (most recent call last):
  File "fairseq-context/train.py", line 360, in <module>
    main(args)
  File "fairseq-context/train.py", line 36, in main
    task = tasks.setup_task(args)
  File "CoCoNut-Artifact-master/fairseq-context/fairseq/tasks/__init__.py", line 19, in setup_task
    return TASK_REGISTRY[args.task].setup_task(args)
  File "CoCoNut-Artifact-master/fairseq-context/fairseq/tasks/translation.py", line 86, in setup_task
    raise Exception('Could not infer language pair, please provide it explicitly')
Exception: Could not infer language pair, please provide it explicitly