# Avatar upload fails due to Linux cook error during Convai packaging

**URL:** <https://forum.convai.com/t/avatar-upload-fails-due-to-linux-cook-error-during-convai-packaging/5760>\
**Category:** Unreal Engine Plugin\
**Tags:** question, unreal-engine\
**Created:** [February 10, 2026, 2:11pm UTC](https://forum.convai.com/t/avatar-upload-fails-due-to-linux-cook-error-during-convai-packaging/5760 "2026-02-10T14:11:44Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![prescila.baptista](https://avatars.discourse-cdn.com/v4/letter/p/838e76/32.png) [@prescila.baptista](https://forum.convai.com/u/prescila.baptista)\
**Post date:** [February 10, 2026, 2:11pm UTC](https://forum.convai.com/t/avatar-upload-fails-due-to-linux-cook-error-during-convai-packaging/5760/1 "2026-02-10T14:11:44Z")

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Hello Convai Support Team,

I am experiencing a consistent failure when attempting to upload an avatar using the Convai Asset Uploader.

The upload process fails during the Linux packaging / cook stage, which prevents the pak file from being generated and stops the upload from completing successfully.

Error details from logs

During the Linux cook process, Unreal Engine reports the following error:

```auto
LogProperty: Error: FStructProperty::Serialize Saving:
Property '/Game/CC_Shaders/Utilities/CR_FaceExpRig.RigVMMemory_Work:
RigVMModel___DISPATCH_RigVMDispatch_ArrayIterator_Element'.
FallbackStruct structure.

```

This error leads to:

```auto
Error_UnknownCookFailure
Packaging failed Linux
Upload failed

```

Environment

- Unreal Engine 5.5.4
- Convai Asset Uploader 3.0.1
- platform: windows 11

The full packaging and cook logs are attached for analysis.

I would appreciate your guidance on:

The cause of this Linux cook failure, and  
Any known limitations or requirements related with uploading avatars to Convai.

Thank you for your support.

Best regards,  
António Januário

[LogStats Stats thread started at 0..txt](https://forum.convai.com/uploads/short-url/j8Q3EHEPEtnhG2RcHs73EFuwIvR.txt) (3.5 MB)

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<div class="post-metadata">

**Author:** ![Anmol](https://yyz2.discourse-cdn.com/flex004/user_avatar/forum.convai.com/anmol/32/4753_2.png) [@Anmol](https://forum.convai.com/u/Anmol)\
**Post date:** [February 11, 2026, 8:54am UTC](https://forum.convai.com/t/avatar-upload-fails-due-to-linux-cook-error-during-convai-packaging/5760/2 "2026-02-11T08:54:12Z")

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Hello António,

Thank you for sharing the logs.

After reviewing them, the Linux cook failure is caused by Blueprint compilation errors. Several animation assets and Blueprints are referencing a missing or invalid Skeleton (USkeleton), which prevents them from compiling and causes the packaging to fail.

Key errors include:

- Unable to retrieve target USkeleton for AS\_ExpSequence

- Animation Blueprints (ABP\_RL\_Rig\_Logic, CCLiveLink\_v23, Convai\_Realusion\_AnimBP) missing assigned Skeleton assets

Please open these assets in Unreal Engine, reassign the correct Skeleton, fix any compilation errors, and ensure all Blueprints compile successfully before packaging again.

Once resolved, the Linux cook and upload should complete successfully.

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<div class="post-metadata">

**Author:** ![system](https://canada1.discourse-cdn.com/flex004/uploads/convai/original/1X/e60ef96aa7334c5ccf6682f6c6dbc20fcfa96b49.png) [@system](https://forum.convai.com/u/system)\
**Post date:** [March 13, 2026, 8:54am UTC](https://forum.convai.com/t/avatar-upload-fails-due-to-linux-cook-error-during-convai-packaging/5760/3 "2026-03-13T08:54:31Z")

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