20. Troubleshoot

This troubleshooting guide is focused on using posn-util.rkt.

Problems

Save your posn-util in your CS folder

This has been the source of a lot of issues:

• Verify that the folder you save in is “Documents” and not “Downloads”.
• If you are not asked where to save, the file probably ended up in Downloads. Go there and drag the file to where you actually want it.

Name the file carefully

Downloading the Racket file, one can end up with a file that has two suffixes (one of them is invisible). If (require "posn-util.rkt") does not work, try (require "posn-util.rkt.rkt"). If that works, delete the extra .rkt.

Sometime people have posn.util.rkt instead. Use the official filename.

Download the file!

You need to actually download the code for posn-util. If you get the error below, you should open up your posn-util.rkt file and check to make sure that it has several hundred lines of code in it.

standard-module-name-resolver: cycle in loading

Save your work first

Racket will not find your posn-util until you save your work in the same folder as the posn-util.rkt file. If you work is “Untitled”, it is not saved and require will not find the library.

Provide error

When (require picturing-programs) is commented out on the first line, you get this error:

provide: this function is not defined

Fix: uncomment the first line.