Unreal 5.6 build on Meta Quest 3 failing due to struct type unknown error

Unreal Engine Questions
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Engine: Unreal Engine 5.6.1
Platform: Android (Meta Quest 3)
ConvAI Plugin Version: v4.0.0-beta.11

Hello! I’m experiencing a persistent crash on startup when trying to deploy my project to the Meta Quest 3. When launched, the app shows my startup icon for a second or two and then immediately crashes. Here is what I believe to be the key error at the end of the application logs:

[2026.02.19-19.36.11:086][ 0]LogProperty: Error: Struct type unknown for property ‘StructProperty /ConvAI/AI/BT/BTService_ProcessAction.BTService_ProcessAction_C:ExecuteUbergraph_BTService_ProcessAction:CallFunc_Array_Get_Item’; perhaps the USTRUCT() was renamed or deleted?

There’s also an “Assertion failed: SchemaIt != SchemaEnd” error immediately after, as well as about a dozen callstack errors, and I’m assuming that both are a direct result of the earlier struct type unknown error. I have confirmed that this error is Convai specific: Without the plugin, I’ve been able to launch my application just fine.

I’ve tried a good dozen things to fix this: I’ve deleted my Binaries, Intermediates, Saved/Cooked, and DerivedDataCache folders multiple times, I’ve tried building my game with an obb instead of just an apk, I’ve tried going to the affected blueprint (BTService_ProcessAction) and manually recompiling (which seems to be the usual fix for this issue), setting the Convai plugin to PreDefault loading in my uproject file, and I’ve tried just deleting the affected package entirely, since it seemed like a package I could live without, but then the error just happened again with a different blueprint, AI_Controller_Convai, which seems much more essential.

My hope is that someone has had a similar issue in the past, or maybe even the same issue. My thought was that maybe it was because I was trying to apply Convai to an AR project, with my ARPawn being used as my ConvaiBasePlayer, but I saw a post on this forum saying that people have gotten VR projects working before, and the default VR Template in Unreal also had this problem when I tried using it: Worked perfectly before Convai was added, immediate crash afterwards. Any advice on this? I’ve included my full log file as an attachment.

MyProject.log (124.4 KB)

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Hello,

Welcome to the Convai Developer Forum!

V4.0.0 beta version does not currently support Android. Please stay tuned for future updates.

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That would certainly explain the issue. I am seeing several other posts from people who’ve gotten Convai working on Meta Quests, though, like this post, so I’m assuming it should be possible. Am I mistaken in assuming that Meta Quest needs android for it’s applications, or is there an earlier version of the Convai plugin that does support android?

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These are for the old version.

You can download it from here.

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@K3 , when will Convai support Android, do you have a timeframe or month & year when we should expect to see Android support?

@ryan.hartz , thank you for linking to my original question. I’m still trying to accomplish an interactive 3D assistant avatar in AR with Convai. K3’s reply to my original question only cited a link to documentation.

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Your post was related to Unity. In Unity, we support Android. Please follow the steps outlined in the documentation and video. If you have any questions, feel free to ask.

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