# Link to Pengines sandbox page is broken (404 error)

**URL:** <https://swi-prolog.discourse.group/t/link-to-pengines-sandbox-page-is-broken-404-error/621>\
**Category:** SWI-Prolog web site and services\
**Created:** [May 7, 2019, 11:14pm UTC](https://swi-prolog.discourse.group/t/link-to-pengines-sandbox-page-is-broken-404-error/621 "2019-05-07T23:14:20Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![prodog](https://avatars.discourse-cdn.com/v4/letter/p/57b2e6/32.png) [@prodog](https://swi-prolog.discourse.group/u/prodog)\
**Post date:** [May 7, 2019, 11:14pm UTC](https://swi-prolog.discourse.group/t/link-to-pengines-sandbox-page-is-broken-404-error/621/1 "2019-05-07T23:14:20Z")

</div>

The link on this page in the section titled \*\* 1.1 Pengine references\*\* to _sandbox.pl_:

[http://www.swi-prolog.org/pldoc/doc\_for?object=section('packages/pengines.html')](http://www.swi-prolog.org/pldoc/doc_for?object=section(%27packages/pengines.html%27))

The link generates a 404 error:

[http://www.swi-prolog.org/pldoc/doc/home/vnc/prolog/lib/swipl/library/sandbox.pl](http://www.swi-prolog.org/pldoc/doc/home/vnc/prolog/lib/swipl/library/sandbox.pl)