diff --git a/hornbeam/src/interpreted.rs b/hornbeam/src/interpreted.rs
index 228d7b9..f75c640 100644
--- a/hornbeam/src/interpreted.rs
+++ b/hornbeam/src/interpreted.rs
@@ -23,6 +23,7 @@ pub use hornbeam_interpreter::Params;
 
 use crate::interpreted::hot_reload::start_hot_reloader;
 pub use lazy_static::lazy_static;
+use tokio::io;
 
 #[cfg(feature = "hot_reload")]
 pub mod hot_reload;
@@ -100,7 +101,11 @@ fn load_new_template_system(
     translation_dir: &Path,
 ) -> Result<LoadedTemplates<FluentLocalisationSystem>, InterpreterError<Infallible, Infallible>> {
     let localisation_system = FluentLocalisationSystem::new(translation_dir, default_locale)
-        .expect("Failed to create Fluent localisation system for Hornbeam environment");
+        .map_err(|err| {
+            InterpreterError::TemplateFindError(format!(
+                "Failed to create Fluent localisation system for Hornbeam environment: {err:?}"
+            ))
+        })?;
     let mut templates = LoadedTemplates::new(localisation_system);
     templates.load_templates_from_dir(template_dir)?;
     Ok(templates)