Problem installing Whalesong

[kruckman@…]

I've just installed Whalesong for the first time. When I try to run it, I get the following error message:

Library/Racket/planet/300/5.3.4/cache/dyoo/whalesong.plt/1/21/parser/parse-bytecode-5.3.rkt:372:20: match: wrong number for fields for structure mod: expected 16 but got 15

at: (name srcname self-modidx prefix provides requires body syntax-body unexported max-let-depth dummy lang-info internal-context pre-submodules post-submodules)
in: (struct mod (name srcname self-modidx prefix provides requires body syntax-body unexported max-let-depth dummy lang-info internal-context pre-submodules post-submodules))

The same happens when I run raco setup.