While working through the first bits of the HtDP2e book, in DrRacket 6.9 on
Mac, I get the following error whenever I try to run any program in the
"Definitions" window that contains (require 2htdp/universe):
link: bad variable linkage;
reference to a variable that is not a procedure or structure-type constant
across all instantiations
reference phase level: 0
variable module: "/Applications/Racket
variable phase: 0
reference in module: "/Applications/Racket
Googling the error didn't help me out, and I'm afraid I'm too much of a noob
right now to understand what's going on. What's more, I'm really sure this
worked fine a few days ago. Restarting DrRacket doesn't help either.
Any suggestions would be most welcome! Thanks in advance :-)
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