# Visual Dataprep Viewport Crash **URL:** \ **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:** 6\ **Page:** 1
**Author:** ![iamjaden](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@iamjaden](https://forums.unrealengine.com/u/iamjaden)\ **Post date:** [November 25, 2022, 4:28pm UTC](https://forums.unrealengine.com/t/visual-dataprep-viewport-crash/715278/1 "2022-11-25T16:28:55Z")
Hi there, i am having trouble using the visual dataprep GLTF importer. I have a fresh Project and it started out working fine but now I get a crash whenever I try to load a GLTF, even a small one containing only three simple objects. Also, even if I create a new project it keeps crashing. In 4.27 it works though. It is always crashing when it tries to “update the 3D viewer”. Does anyone has a clue or a hint why this happens and what to do to get it running again? For any help I’d be thankful! regards, philipp This is the message I get: Assertion failed: false [File:D:\build++UE5\Sync\Engine\Plugins\Enterprise\DataprepEditor\Source\DataprepEditor\Private\Widgets\SDataprepEditorViewport.cpp] [Line: 861] 0x00007ff8ee48e489 UnrealEditor-DataprepEditor.dll!UnknownFunction [] 0x00007ff8ee5b3385 UnrealEditor-DataprepEditor.dll!UnknownFunction [] 0x00007ff8ee691715 UnrealEditor-DataprepEditor.dll!UnknownFunction [] 0x00007ff8ee691056 UnrealEditor-DataprepEditor.dll!UnknownFunction [] 0x00007ff8ee5c505a UnrealEditor-DataprepEditor.dll!UnknownFunction [] 0x00007ff8ee551b9c UnrealEditor-DataprepEditor.dll!UnknownFunction [] 0x00007ff8ee536ed8 UnrealEditor-DataprepEditor.dll!UnknownFunction [] 0x00007ff91d3905f6 UnrealEditor-Slate.dll!UnknownFunction [] 0x00007ff91d3b6793 UnrealEditor-Slate.dll!UnknownFunction [] 0x00007ff91d14a3e8 UnrealEditor-Slate.dll!UnknownFunction [] 0x00007ff91d12ffca UnrealEditor-Slate.dll!UnknownFunction [] 0x00007ff91d196743 UnrealEditor-Slate.dll!UnknownFunction [] 0x00007ff91d185223 UnrealEditor-Slate.dll!UnknownFunction [] 0x00007ff91d17aecc UnrealEditor-Slate.dll!UnknownFunction [] 0x00007ff97a0119a2 UnrealEditor-ApplicationCore.dll!UnknownFunction [] 0x00007ff979ff67d1 UnrealEditor-ApplicationCore.dll!UnknownFunction [] 0x00007ff97a014391 UnrealEditor-ApplicationCore.dll!UnknownFunction [] 0x00007ff979feff93 UnrealEditor-ApplicationCore.dll!UnknownFunction [] 0x00007ffa08eae858 USER32.dll!UnknownFunction [] 0x00007ffa08eae299 USER32.dll!UnknownFunction [] 0x00007ff97a015849 UnrealEditor-ApplicationCore.dll!UnknownFunction [] 0x00007ff758727332 UnrealEditor.exe!UnknownFunction [] 0x00007ff75874287d UnrealEditor.exe!UnknownFunction [] 0x00007ff75874296a UnrealEditor.exe!UnknownFunction [] 0x00007ff758745680 UnrealEditor.exe!UnknownFunction [] 0x00007ff7587571b4 UnrealEditor.exe!UnknownFunction [] 0x00007ff75875a516 UnrealEditor.exe!UnknownFunction [] 0x00007ffa0a1674b4 KERNEL32.DLL!UnknownFunction [] 0x00007ffa0a5226a1 ntdll.dll!UnknownFunction [] Crash in runnable thread StallDetectorThread ---
**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")
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) ---
**Author:** ![iamjaden](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@iamjaden](https://forums.unrealengine.com/u/iamjaden)\ **Post date:** [December 6, 2022, 3:52pm UTC](https://forums.unrealengine.com/t/visual-dataprep-viewport-crash/715278/3 "2022-12-06T15:52:41Z")
Hi @UE_FlavienP , this worked like a charm! I am so glad you had a fix for me, just in time! Thanks so much! ---
**Author:** ![Antoine\_Guillo](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/antoine_guillo/32/924118_2.png) [@Antoine\_Guillo](https://forums.unrealengine.com/u/Antoine_Guillo)\ **Post date:** [December 6, 2022, 4:03pm UTC](https://forums.unrealengine.com/t/visual-dataprep-viewport-crash/715278/4 "2022-12-06T16:03:40Z")
FYI that procedure won’t be needed with 5.1.1, which will have the fix for this issue. 🙂 Cheers, Antoine ---
**Author:** ![KULTRA\_LTD](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/kultra_ltd/32/974206_2.png) [@KULTRA\_LTD](https://forums.unrealengine.com/u/KULTRA_LTD)\ **Post date:** [January 24, 2023, 6:53pm UTC](https://forums.unrealengine.com/t/visual-dataprep-viewport-crash/715278/5 "2023-01-24T18:53:49Z")
> [@UE\_FlavienP](#): > > Untick them and do not save those assets Thank you! It is working!!! 😀 ---
**Author:** ![Repe](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Repe](https://forums.unrealengine.com/u/Repe)\ **Post date:** [January 25, 2023, 6:09am UTC](https://forums.unrealengine.com/t/visual-dataprep-viewport-crash/715278/6 "2023-01-25T06:09:33Z")
Thanks for the fix. I also created short video about this fix/workaround: > > [https://youtu.be/iq7xOTfMy6A](https://youtu.be/iq7xOTfMy6A) > > Visual dataprep is great tool! We have to keep it working 😉