BSA-drracket-teachpacks

Checksum error An error occurred while updating the package checksum.

pkg-desc: contract violation
  expected: (or/c string? #f)
  given: #<void>
  in: the 4th argument of
      (->*
       (string?
        (or/c
         #f
         'file
         'dir
         'link
         'static-link
         'file-url
         'dir-url
         'git
         'git-url
         'github
         'clone
         'name)
        (or/c string? #f)
        (or/c string? #f)
        boolean?)
       (#:path (or/c #f path-string?))
       pkg-desc?)
  contract from: <collects>/pkg/lib.rkt
  blaming: /home/pkgserver/racket-pkg-website/src/pkg-index/update.rkt
   (assuming the contract is correct)
  at: <collects>/pkg/lib.rkt:78:3
  context...:
   /home/pkgserver/racket/collects/racket/contract/private/blame.rkt:350:0: raise-blame-error
   /home/pkgserver/racket/collects/racket/contract/private/arrow-val-first.rkt:600:8: loop
   [repeats 3 more times]
   /home/pkgserver/racket/collects/racket/contract/private/arrow-val-first.rkt:558:5: mk-call
   /home/pkgserver/racket/collects/racket/contract/private/arrow-val-first.rkt:555:3
   /home/pkgserver/racket-pkg-website/src/pkg-index/update.rkt:159:0: update-from-content
   /home/pkgserver/racket-pkg-website/src/pkg-index/update.rkt:40:2
   /home/pkgserver/racket-pkg-website/src/pkg-index/update.rkt:23:0: update-checksums
   /home/pkgserver/racket-pkg-website/src/pkg-index/update.rkt:192:0: do-update!
   /home/pkgserver/racket-pkg-website/src/pkg-index/common.rkt:157:0: run!
   /home/pkgserver/racket-pkg-website/src/pkg-index/update.rkt:207:0: run-update!