Using Xcode14 and iOS version is 16.0
polaris_
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I encountered the error today when using RealityComposer with Xcode version 14.0.1.
Instead, RealityComposer on the iPad app was able to output usdz, so I am using that.
Sorry, when I did complex arrangement of objects (grouping, use of many objects), I have also faced the problem on the iPad app.
Depending on the assets used, sometimes single placement was not even possible. It seems that this is not only a problem of placement complexity.