# Error using Graphviz on Swish (graphviz program dot not installed) SOLVED

**URL:** <https://swi-prolog.discourse.group/t/error-using-graphviz-on-swish-graphviz-program-dot-not-installed-solved/935>\
**Category:** SWI-Prolog web site and services\
**Created:** [July 9, 2019, 2:45pm UTC](https://swi-prolog.discourse.group/t/error-using-graphviz-on-swish-graphviz-program-dot-not-installed-solved/935 "2019-07-09T14:45:18Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![jan](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/jan/32/4_2.png) [@jan](https://swi-prolog.discourse.group/u/jan)\
**Post date:** [July 9, 2019, 3:04pm UTC](https://swi-prolog.discourse.group/t/error-using-graphviz-on-swish-graphviz-program-dot-not-installed-solved/935/2 "2019-07-09T15:04:04Z")

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Thanks for reporting. The OS was re-installed and graphviz was forgotten. Works again.

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_[View the full topic](https://swi-prolog.discourse.group/t/error-using-graphviz-on-swish-graphviz-program-dot-not-installed-solved/935)._