# The URBANopt simulation stars but fails to run on Windows

**URL:** <https://discourse.ladybug.tools/t/the-urbanopt-simulation-stars-but-fails-to-run-on-windows/18022>\
**Category:** dragonfly\
**Created:** [April 13, 2022, 9:48pm UTC](https://discourse.ladybug.tools/t/the-urbanopt-simulation-stars-but-fails-to-run-on-windows/18022 "2022-04-13T21:48:57Z")\
**Posts on this page:** 1\
**Showing post:** 26

<div class="post-metadata">

**Author:** ![chris](https://discourse.ladybug.tools/user_avatar/discourse.ladybug.tools/chris/32/10179_2.png) [@chris](https://discourse.ladybug.tools/u/chris)\
**Post date:** [June 29, 2023, 8:45pm UTC](https://discourse.ladybug.tools/t/the-urbanopt-simulation-stars-but-fails-to-run-on-windows/18022/26 "2023-06-29T20:45:47Z")

</div>

There’s a good chance that this issue is the result of the bug here that has been fixed and the patch is available via the LB Versioner component:

> [@“DF RUN URBANopt error”：Solution exception:The URBANopt simulation failed to run.No results were found at: C: \\ Users \\ HP \\ simulation \\ kkpp\\ run \\ honeybee scenario](https://discourse.ladybug.tools/t/df-run-urbanopt-error-solution-exception-the-urbanopt-simulation-failed-to-run-no-results-were-found-at-c-users-hp-simulation-kkpp-run-honeybee-scenario/21988/5):
>
> Hi everyone, Sorry for the late reply here and thanks for posting, @huloujun , @samustpon , and @Geo_curious , so that I can provide the answer. This issue is not because you have done anything wrong in your model setup or your installation. There was a breaking change to one of the external ruby gems that used by URBANopt, which has essentially broken the URBANopt simulation for all users no matter the version of Dragonfly or URBANopt. In any event, I have pushed a patch a few days ago: I…

@vijesh 's second issue seems a bit different but the message is indicating that the SQL result file is open in another program and has been locked. So I assume that closing that other program should allow the results to be read from the SQL file.

---

_[View the full topic](https://discourse.ladybug.tools/t/the-urbanopt-simulation-stars-but-fails-to-run-on-windows/18022)._