# Invalid namespace - light building failed

**URL:** <https://forums.unrealengine.com/t/invalid-namespace-light-building-failed/449460>\
**Category:** Rendering\
**Tags:** light, swarm-agent, unreal-engine, fail, question\
**Created:** [May 23, 2019, 12:09pm UTC](https://forums.unrealengine.com/t/invalid-namespace-light-building-failed/449460 "2019-05-23T12:09:45Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![anonymous\_user\_99464f66](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_99464f66](https://forums.unrealengine.com/u/anonymous_user_99464f66)\
**Post date:** [May 23, 2019, 12:09pm UTC](https://forums.unrealengine.com/t/invalid-namespace-light-building-failed/449460/1 "2019-05-23T12:09:45Z")

</div>

Hi guys,

Been struggling with this issue for a while now. When I build my levels, I always get an error saying the light building failed. When I open up the Swarm Agent, it gives me an “invalid namespace” error. I’ve tried multiple things and looked around for answers but no luck so far.

If anyone has any idea how to fix this, please let me know.

Thx!