I can't figure this out!

So the thing you have done wrong is that you have imported matplotlib.pyplot and used this to make a new object, instead of using the proper module to create a PDF-object. I'll walk you through it :

First the challenge asks you to create a PDF-object and store it in the variable "my_pdf", to do this you must use the module you have imported from 'matplotlib.backends.backend_pdf', which you have already done on line 2 :

from matplotlib.backends.backend_pdf import PdfPages

Then you need to create a pdf-object using this module and store it in the variable 'my_pdf'. This is were you have used an other module you have imported instead of the one you should be using :

my_pdf = PdfPages()

Finally you are asked to end the PDF Stream, which is done with the "close()" method within the PdfPages-module.

my_pdf.close()

It is a very good practice to learn how to figure out this things by using the documentation. The more you practice the easier it gets. And as your knowledge grows you will remember the ones you use a lot. You can have a look at the documentation and use for the PdfPages-module at "https://matplotlib.org/api/backend_pdf_api.html"

I hope this helped.