# Can't call library clpfd (Swish)

**URL:** <https://swi-prolog.discourse.group/t/cant-call-library-clpfd-swish/2547>\
**Category:** SWI-Prolog web site and services\
**Tags:** swish\
**Created:** [June 21, 2020, 9:55am UTC](https://swi-prolog.discourse.group/t/cant-call-library-clpfd-swish/2547 "2020-06-21T09:55:24Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![EricGT](https://avatars.discourse-cdn.com/v4/letter/e/f1d935/32.png) [@EricGT](https://swi-prolog.discourse.group/u/EricGT)\
**Post date:** [June 21, 2020, 10:04am UTC](https://swi-prolog.discourse.group/t/cant-call-library-clpfd-swish/2547/2 "2020-06-21T10:04:12Z")

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> [@Sanjuro](#):
>
> i can’t find any way to solve the issue.

To keep users from using the Prolog code to hack into the site, the code is run in a sandbox and in the sandbox only certain predicates are allowed thus the error message.

![image](https://global.discourse-cdn.com/free1/uploads/swiprolog/original/2X/0/06ad74d7ab3f79f375fcc69e4e09efadf2f93785.png)

`No permission to call sandboxed <predicate>`

Apparently the problem has [occurred before](https://swi-prolog.discourse.group/t/no-permission-to-call-sandboxed-source-location-2216-2218-error/1584) and can be fixed with restarting SWISH but I don’t have that ability.

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_[View the full topic](https://swi-prolog.discourse.group/t/cant-call-library-clpfd-swish/2547)._