While running train.py got ValueError: not enough values to unpack (expected 3, got 2)

[GauravKrRoy]

Traceback (most recent call last):
File "train.py", line 133, in
main(opt)
File "train.py", line 120, in main
train(dataloader, model, crit, optimizer, exp_lr_scheduler, opt, rl_crit)
File "train.py", line 40, in train
seq_probs, _ = model(fc_feats, labels, 'train')
File "/home/pg2018/cse/18071003/.conda/envs/env_name/lib/python3.7/site-packages/torch/nn/modules/module.py", line 493, in call
result = self.forward(*input, **kwargs)
File "/home/pg2018/cse/18071003/video-captioning/models/S2VTModel.py", line 34, in forward
batch_size, n_frames, _ = vid_feats.shape
ValueError: not enough values to unpack (expected 3, got 2)