Error in the precompiling of QuantumOptics package in Julia 1.9.2

I can’t reproduce your error - QuantumOptics 1.0.13 installed and precompiled just fine for me on Julia 1.9.1 (on Windows, but your error doesn’t look OS specific).

I’m not sure whether you have a question about IJulia as well, but if so that’s probably a separate thread (unless you only see an issue with QuantumOptics in IJulia and not in the REPL).