nosetests command shows error in powershell, what should i do?

Question

I am a newbie to python and learning python from Zed A. shaw's book "Learn python the hard way" (3rd edition).

I am trying to run the nosetests command but it does nothing rather shows some error message (as shown in the screenshot attached).

Link to the exercise

Could you please help me out what to do?

Thanks in advance.

Error:

Answer 1

According to the OP, he was running the command in the wrong directory.