Neither of the women is the one who spoke to me yesterday

Neither of the women is the one who spoke to me yesterday.
Is there any error?

No error - ‘neither’ indicates one (singular) of the two women.

Beeesneees,
Does this - “Neither of the women is the one who spoke to me yesterday.”
mean
either
“The one who spoke to me yesterday is neither of the women.”
or
“The one who spoke to me yesterday is not any one of the two women.”?

You could put it both ways. ‘Neither’ simply means ‘not one nor the other of two things or people.’

Woman A and woman B are the women you are considering now (the two people).
The person who spoke to you yesterday was a different woman (woman C).

Either of the women is not the women who spoke to me yesterday.

Is the meaning of the above sentence same with the original.

That sentence is incorrect.

Either of the women is not the woman who spoke to me yesterday.

I think this is correct now. Is it?

No - although you have corrected ‘woman’, ‘either’ does not match ‘not’.