# “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

**URL:** <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>\
**Category:** dragonfly\
**Tags:** energy\
**Created:** [June 14, 2023, 1:31am UTC](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 "2023-06-14T01:31:10Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**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 16, 2023, 1:04pm UTC](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 "2023-06-16T13:04:42Z")

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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:

> <https://github.com/ladybug-tools/honeybee-openstudio-gem/pull/314>

If you run the [LB Versioner](https://docs.ladybug.tools/ladybug-primer/components/5_version/versioner) and restart Rhino, you can get a version of the software with the patch. You may also need to manually delete your old URBANopt project folder before running the new simulation just to make sure that the ruby gem with the breaking change is not there.

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_[View the full topic](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)._