# Mesh throwing 'Overlapping UVs' error

**URL:** <https://forums.unrealengine.com/t/mesh-throwing-overlapping-uvs-error/372463>\
**Category:** Rendering\
**Tags:** overlapping-uvs, unreal-engine, Lightmap, Lighting, question\
**Created:** [October 4, 2016, 10:31pm UTC](https://forums.unrealengine.com/t/mesh-throwing-overlapping-uvs-error/372463 "2016-10-04T22:31:29Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![Tim\_Hobson](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Tim\_Hobson](https://forums.unrealengine.com/u/Tim_Hobson)\
**Post date:** [October 5, 2016, 12:41pm UTC](https://forums.unrealengine.com/t/mesh-throwing-overlapping-uvs-error/372463/7 "2016-10-05T12:41:16Z")

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Make sure that you’ve got your lightmap coordinate index set to 1. So far, you’ve shown that you’ve set the build settings (for auto-generated lightmap UVs) and that you’re looking at UV 1 for the lightmap UV.

Under the static mesh settings tab you’ll find Lightmap Coordinate Index. This needs to be set to 1 so that it uses the correct UV. The build settings you showed are only used for generation.

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