Got error when trying to build my project with fusion

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When running in Editor mode, everything works properly. But when I try to build the project, this error occurs.

Here is the code:

It seems that something is wrong with the privateRoomOwnerArr field, because if I commented it, the build process will show no errors.

Don't know what's wrong with my code. I have used NetworkArray to do some test in another test project, and no errors when building that project.