If anyone still facing this issue, here's a possible reason:
RealityConverter is not supporting GLTF fiels with Draco compressed meshes or Ktx/any compressed textures.
To avoid this error, you can Import your GLTF files it to Blender and Export it back to GLTF with all compressions disabled. Now the rexported gltf file will work in Reality Converter for usdz conversion.
silentminimalist
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