Undefined lines in PDF

I have been trying to print the pdf from:
https://www.instructables.com/id/DIY-Raspberry-Pi-Indoor-Outdoor-Webcam/
but even in the PDF preview of the document starting at page 7 and including page 8 I get a seires of lines number from 1 through 62 that all say "Undefined" and when I print the document that is exactly what it prints.  It starts to print the picture from step 7 but fails somewhere in the middle and then kicks out 2 pages of undefines before going to page 9.  I am using Adobe Acrobat Pro 8 but had the same results with the latest Adobe Reader DC.  My OS is Windows 7 with 64gb ram and 1tb hard drive.  The browser is Firefox 54.

Picture of Undefined lines in PDF