# Building Light Causes Unreal Editor to Crash, Freezes At Exporting Light Data 100%

**URL:** <https://forums.unrealengine.com/t/building-light-causes-unreal-editor-to-crash-freezes-at-exporting-light-data-100/497274>\
**Category:** Feedback & Requests\
**Tags:** unreal-engine, crash, UE5-0, Lighting, UE4-27, question\
**Created:** [February 12, 2022, 2:24pm UTC](https://forums.unrealengine.com/t/building-light-causes-unreal-editor-to-crash-freezes-at-exporting-light-data-100/497274 "2022-02-12T14:24:42Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![anonymous\_user\_07ba972c](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_07ba972c](https://forums.unrealengine.com/u/anonymous_user_07ba972c)\
**Post date:** [February 12, 2022, 2:24pm UTC](https://forums.unrealengine.com/t/building-light-causes-unreal-editor-to-crash-freezes-at-exporting-light-data-100/497274/1 "2022-02-12T14:24:42Z")

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5-0-0  
Hi All,  
I seem to have a problem with building light data in unreal engine 5.0.0 Early access 2  
when I click on build lighting it takes 10 mins to build and then when it says building light data 100%, it just freezes. the only way I can stop it from freezing is if I go to the task manager and manually kill the task, which I don’t think is healthy for my project. when I do go to task manager, I see that it is consuming 5gb of my memory.

Crash Log, I dont have any crash log, i am not too sure about any other logs

My Specs:

CPU: Intel i5 10th Gen  
GPU: Gtx 1650  
RAM: 16GB DDR4 Ram 1333Mhz

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**Author:** ![Jimbohalo10](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jimbohalo10/32/961440_2.png) [@Jimbohalo10](https://forums.unrealengine.com/u/Jimbohalo10)\
**Post date:** [February 13, 2022, 5:19pm UTC](https://forums.unrealengine.com/t/building-light-causes-unreal-editor-to-crash-freezes-at-exporting-light-data-100/497274/2 "2022-02-13T17:19:27Z")

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Hi @anonymous_user_07ba972c,  
I had similar problems I fixed them here  
[Visual Studio 2022 Preview is 64 bit Compile Lighting locally](https://forums.unrealengine.com/t/visual-studio-2022-preview-is-64-bit-and-compiles-and-runs-ue-5-0-ea-approximately-20-faster/237164/35)  
You can use this on any UE5 source version as well.

You may need to add a 64GB pagefile.sys, which I documented in  
[Install a bigger pagefile.sys](https://forums.unrealengine.com/t/cant-create-c-project-or-use-c/238169/2)  
using 5GB is quite normal . I have once used 12GB during project conversion