could not find '{backend}' .app bundle inside {} (backend ma

Error message

could not find '{backend}' .app bundle inside {} (backend may not ship as an app for target '{target}')

What it means

Error "could not find '{backend}' .app bundle inside {} (backend may not ship as an app for target '{target}')" thrown in denoland/deno.

Source

Thrown at cli/tools/desktop.rs:2114

  /// Locate the LAUFEY `.app` bundle for `backend` on a macOS `target`.
  async fn find_app_bundle(
    &self,
    backend: &str,
    target: &str,
  ) -> Result<PathBuf, AnyError> {
    if let Some(dev_dir) = laufey_dev_dir() {
      return locate_dev_app_bundle(&dev_dir, backend).ok_or_else(|| {
        deno_core::anyhow::anyhow!(
          "could not find '{backend}' .app bundle under {} (set via {})",
          dev_dir.display(),
          LAUFEY_DEV_DIR_ENV
        )
      });
    }

    let dir = self.ensure_downloaded(backend, target).await?;
    locate_app_bundle(&dir, backend).ok_or_else(|| {
      deno_core::anyhow::anyhow!(
        "could not find '{backend}' .app bundle inside {} (backend may not ship as an app for target '{target}')",
        dir.display()
      )
    })
  }

  /// Directory containing the backend binary and its support files (used on
  /// Windows / Linux where support files sit alongside the binary).
  async fn find_binary_dir(
    &self,
    backend: &str,
    target: &str,
  ) -> Result<PathBuf, AnyError> {
    let binary = self.find_binary(backend, target).await?;
    let parent = binary.parent().ok_or_else(|| {
      deno_core::anyhow::anyhow!(
        "LAUFEY backend binary has no parent directory: {}",
        binary.display()

View on GitHub (pinned to 89f33cbef2)

When it happens

Trigger: Thrown at cli/tools/desktop.rs:2114 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of denoland/deno@89f33cbef2 (2026-08-16). Data as JSON: /api/errors/f190e7d6bf317016. Report an issue: GitHub.