bevyengine/bevy · error

FileWatcher::get_asset_path() failed to strip prefix from ab

Error message

FileWatcher::get_asset_path() failed to strip prefix from absolute path: absolute_path={}, root={}

What it means

Panics in FileWatcher::get_asset_path when Path::strip_prefix fails: the absolute path of a changed file is not located under the watcher's root directory. Without a relative remainder there is no asset path to report, so the watcher cannot map the filesystem event to an asset.

Source

Thrown at crates/bevy_asset/src/io/file/file_watcher.rs:64

            },
        )?;
        Ok(FileWatcher { _watcher: watcher })
    }
}

impl AssetWatcher for FileWatcher {}

/// Converts the provided path into an absolute one.
fn make_absolute_path(path: &Path) -> Result<PathBuf, std::io::Error> {
    // We use `normalize` + `absolute` instead of `canonicalize` to avoid reading the filesystem to
    // resolve the path. This also means that paths that no longer exist can still become absolute
    // (e.g., a file that was renamed will have the "old" path no longer exist).
    Ok(normalize_path(&std::path::absolute(path)?))
}

pub(crate) fn get_asset_path(root: &Path, absolute_path: &Path) -> (PathBuf, bool) {
    let relative_path = absolute_path.strip_prefix(root).unwrap_or_else(|_| {
        panic!(
            "FileWatcher::get_asset_path() failed to strip prefix from absolute path: absolute_path={}, root={}",
            absolute_path.display(),
            root.display()
        )
    });
    let is_meta = relative_path.extension().is_some_and(|e| e == "meta");
    let asset_path = if is_meta {
        relative_path.with_extension("")
    } else {
        relative_path.to_owned()
    };
    (asset_path, is_meta)
}

/// This is a bit more abstracted than it normally would be because we want to try _very hard_ not to duplicate this
/// event management logic across filesystem-driven [`AssetWatcher`] impls. Each operating system / platform behaves
/// a little differently and this is the result of a delicate balancing act that we should only perform once.
pub(crate) fn new_asset_event_debouncer(

View on GitHub (pinned to 396ca72708)

Solutions

1. Ensure the watched root passed to FileWatcher::new actually contains the assets being watched
2. Watch the correct asset source directory (e.g. the assets/ folder configured for the app)
3. Avoid symlinked or remapped paths that make changed files fall outside the watcher root

When it happens

Trigger: Thrown at crates/bevy_asset/src/io/file/file_watcher.rs:64 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of bevyengine/bevy@396ca72708 (2026-08-20). Data as JSON: /api/errors/d21ec05ebeaf210e. Report an issue: GitHub.