InstantiationFailure error while pre-opening mapped directory: invalid map

[giteewif]

    let wasi_ctx = WasiCtxBuilder::new()
        .set_pre_open_path(vec![&work_path], vec!["/"])
        .build();

    module.set_wasi_context(wasi_ctx);

    let instance = Instance::new(&runtime, &module, 1024 * 64);
    // assert!(instance.is_ok());
    let instance: &Instance = &instance.unwrap();

fail to map directory to "/"

called `Result::unwrap()` on an `Err` value: InstantiationFailure("error while pre-opening mapped directory: invalid map\n")

[lum1n0us]

Based on the error information provided, it seems that the work_path is an empty string.