The Dataset for Pretraining Word Embedding

I encountered a problem while repeating the " 14.3.4. Putting All Things Together" part. It seems that there’s something wrong in the ForkingPickler() function of The error messages are as follows. The problem still confuses me after searching the Internet.I’m a rookie and I really need your guidance.Looking forward to your reply.

![2|690x319](I’m sorry that I can’t put all of them in one reply due to the limitations to the new users.The other 2 pictures will be posted below. )

The second picture.

The last one.