This is because pict3d requires racket/struct, which was only added in racket 
version 6.3. If you have an older version, you'll get this error. 

There should probably be a version exception for older versions that doesn't 
require racket/struct. Or would it be better to change pict3d to not rely on 
racket/struct and use unstable/struct instead?

> On Jan 12, 2016, at 10:32 AM, Jay McCarthy <[email protected]> wrote:
> 
> Can you say what version of Racket you are using?
> 
> `racket --version`
> 
> will tell you
> 
> Jay
> 
> On Tue, Jan 12, 2016 at 10:25 AM,  <[email protected]> wrote:
>> Trying to run some of the default tests from pict3d (spaceship.rkt) resulted 
>> in this error. When I downloaded the pict3d package to Racket I got a lot of 
>> the same (if I remember correctly) directory errors. Is this most likely 
>> from how I installed racket to begin with?  Ubuntu 14.04 LTS
>> 
>> -Thanks
>> 
>> default-load-handler: cannot open module file module path: racket/struct 
>> path: /home/biz/share/racket/collects/racket/struct.rkt system error: No 
>> such file or directory; errno=2
>> 
>> /home/biz/share/racket/pkgs/gui-lib/mred/private/snipfile.rkt: 324:2
>> 
>> /home/biz/share/racket/collects/racket/require-transform.rkt: 266:2
>> ...
>> 
>> --
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> 
> 
> 
> -- 
> Jay McCarthy
> Associate Professor
> PLT @ CS @ UMass Lowell
> http://jeapostrophe.github.io
> 
>           "Wherefore, be not weary in well-doing,
>      for ye are laying the foundation of a great work.
> And out of small things proceedeth that which is great."
>                          - D&C 64:33
> 
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