# Lighting build failed. Swarm failed to kick off

**URL:** <https://forums.unrealengine.com/t/lighting-build-failed-swarm-failed-to-kick-off/287953>\
**Category:** Rendering\
**Tags:** swarm, unreal-engine, crash, editor, Lighting, question\
**Created:** [July 11, 2014, 2:50pm UTC](https://forums.unrealengine.com/t/lighting-build-failed-swarm-failed-to-kick-off/287953 "2014-07-11T14:50:55Z")\
**Posts on this page:** 3\
**Page:** 3

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**Author:** ![Anonymous\_c4c1a0831aea4e6c97579f1eec1a3519](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Anonymous\_c4c1a0831aea4e6c97579f1eec1a3519](https://forums.unrealengine.com/u/Anonymous_c4c1a0831aea4e6c97579f1eec1a3519)\
**Post date:** [March 4, 2021, 7:53am UTC](https://forums.unrealengine.com/t/lighting-build-failed-swarm-failed-to-kick-off/287953/41 "2021-03-04T07:53:18Z")

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thank you!!! You’re so cool

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**Author:** ![Anonymous\_c4c1a0831aea4e6c97579f1eec1a3519](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Anonymous\_c4c1a0831aea4e6c97579f1eec1a3519](https://forums.unrealengine.com/u/Anonymous_c4c1a0831aea4e6c97579f1eec1a3519)\
**Post date:** [March 4, 2021, 7:54am UTC](https://forums.unrealengine.com/t/lighting-build-failed-swarm-failed-to-kick-off/287953/42 "2021-03-04T07:54:54Z")

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thank you very much ~ ! grateful heart ~~~~

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**Author:** ![Bi2022](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/bi2022/32/934168_2.png) [@Bi2022](https://forums.unrealengine.com/u/Bi2022)\
**Post date:** [May 7, 2024, 2:30pm UTC](https://forums.unrealengine.com/t/lighting-build-failed-swarm-failed-to-kick-off/287953/43 "2024-05-07T14:30:13Z")

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For future reference, this [solution](https://www.youtube.com/watch?v=zv97nid152w&t=87s&ab_channel=Markom3D) actually worked for me. I am using unreal engine source code build. So, reopen the solution file, search `unreallightmass` and build. The build will generate two/or some errors, but after that this rebuild lighting issue will be gone (finger cross).

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