"The specified module could not be found." when running bevy example on Windows

[zoeesilcock]

I was trying to integrate hot-lib-reloader into my bevy project and got to the point where everything compiled and ran, but the hot reloading wasn't working. After trying to fix it in various ways I decided to try the example from the repo to sanity check my system setup. I ran the cargo watch line and it compiled successfully. Next I ran the cargo run line which compiled successfully but then panicked just after it launched. The panic is on line 9 which is the hot_lib_reloader::hot_module line and running the exact same command without the --features reload part worked and gave a working game.

I also tested on MacOS and that gave me a fully functioning example with working hot reloading, so it appears to be a Windows specific issue.

On Windows I used Powershell, but I also tried cmd.exe and got the same result. I am using rustc version 1.80.0-nightly in both cases.

Full output from from cargo run on Windows:

PS C:\Users\<me>\Developer\hot-lib-reloader-rs\examples\bevy>  cargo run --features reload --target-dir "target-bin"
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.44s
     Running `target-bin\debug\bin.exe`
2024-05-19T07:19:24.415852Z  INFO bevy_winit::system: Creating new window "App" (0v0)
2024-05-19T07:19:24.794028Z  INFO bevy_render::renderer: AdapterInfo { name: "NVIDIA GeForce GTX 1080", vendor: 4318, device: 7040, device_type: DiscreteGpu, driver: "NVIDIA", driver_info: "551.86", backend: Vulkan }
thread 'Compute Task Pool (23)' panicked at src/main.rs:9:1:
failed to create hot reload loader: LibraryLoadError(LoadLibraryExW { source: Os { code: 126, kind: Uncategorized, message: "The specified module could not be found." } })
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
thread 'thread 'thread 'Compute Task Pool (19)Encountered a panic in system `<unnamed>thread 'Compute Task Pool (20)Compute Task Pool (14)bin::systems_hot::move_other_ships' panicked at ' panicked at ' panicked at ' panicked at `!
src/main.rssrc/main.rssrc/main.rssrc/main.rs::::9:9991::::
111:
Once instance has previously been poisonedOnce instance has previously been poisoned
:
:
Encountered a panic in system `Once instance has previously been poisoned
Once instance has previously been poisonedbin::systems_hot::bullet_movement_system

`!
Encountered a panic in system `bin::systems_hot::spawn_other_ships`!
Encountered a panic in system `bin::systems_hot::bullet_hit_system`!
Encountered a panic in system `bin::systems_hot::player_shooting_system`!
Encountered a panic in system `bevy_app::main_schedule::Main::run_main`!
error: process didn't exit successfully: `target-bin\debug\bin.exe` (exit code: 101)

Let me know if I can test anything to help resolve this.

[revillo]

I had this issue for a while, and in my case the solution was using "cdylib" instead of "dylib" in the dynamically reloaded library cargo.toml:

[lib] 
crate-type = ["rlib", "cdylib"]

[programlife555]

thread 'tokio-runtime-worker' panicked at crates\frontend\src\logics\theme.rs:11:1:
failed to create hot reload loader: LibraryLoadError(LoadLibraryExW { source: Os { code: 126, kind: Uncategorized, message: "The specified module could not be found." } })

Same error as you, it doesn't work under Windows, it works under Linux.