Refuse an unreadable file with a gr.Error

process_fn read the input with soundfile outside any try, so a file that is not audio failed with an uncaught exception, which HARP shows as a crash. It is refused with a gr.Error naming the problem instead.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app.py

@@ -62,7 +62,10 @@ def process_fn(input_audio_path: str, output_sample_rate: str) -> str:
     # under ZeroGPU's emulation
     if not input_audio_path:
         raise gr.Error("Choose an audio file.")
-    audio, input_rate = sf.read(input_audio_path, always_2d=True)
+    try:
+        audio, input_rate = sf.read(input_audio_path, always_2d=True)
+    except Exception as exc:
+        raise gr.Error(f"Could not read the audio file: {exc}") from exc
     if len(audio) == 0:
         raise gr.Error("The audio file is empty.")
     duration = len(audio) / input_rate