# Visual Dataprep Viewport Crash

**URL:** <https://forums.unrealengine.com/t/visual-dataprep-viewport-crash/715278>\
**Category:** Pipeline & Plugins\
**Tags:** Datasmith, unreal-engine, Visual-Dataprep\
**Created:** [November 25, 2022, 4:28pm UTC](https://forums.unrealengine.com/t/visual-dataprep-viewport-crash/715278 "2022-11-25T16:28:55Z")\
**Posts on this page:** 1\
**Showing post:** 2

<div class="post-metadata">

**Author:** ![UE\_FlavienP](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/ue_flavienp/32/1194546_2.png) [@UE\_FlavienP](https://forums.unrealengine.com/u/UE_FlavienP)\
**Post date:** [November 28, 2022, 1:16pm UTC](https://forums.unrealengine.com/t/visual-dataprep-viewport-crash/715278/2 "2022-11-28T13:16:26Z")

</div>

We are still investigating but for some reason UE is removing some files necessary to the dataprep.

Those dirty assets (with the stars) are missing in your plugin dataprep core

 ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/9/2/4/924a620a4ceb016d1dce5758f75d49ff2f0207de.png)

To get them back you will have to do a “verify” on your UE install in the epic games launcher

To not lose them again, do as @Antoine_Guillo recommends: after running dataprep they will be marked dirty, when you “save all” assets or quit unreal, **Untick them and do not save those assets**

 ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/4/8/e/48e0acfcf45bbe38d098d1d22c796962860ad3a3.jpeg)

---

_[View the full topic](https://forums.unrealengine.com/t/visual-dataprep-viewport-crash/715278)._