NLP Fastai

Hello All,

Trust you all doing well and safe!!.

I have recently started with NLP in Fastai and I’m going the Vietnamese language and executing the same code of fastai course 1 NLP.
But I’m facing some problems in it.
Below is the snapshot for the error:

It would be a great help if anyone can suggest there expert advice to solve this error.

Thanking you in advance.

@jeremy it would be very helpful, if you can share your valuable insights for the same Professor.

Rahul Ramchandra Uppari.