Include traceback in MIDI inference errors

handler.py

@@ -30,6 +30,7 @@ import os
 import subprocess
 import sys
 import tempfile
+import traceback
 import wave
 from typing import Any
 
@@ -135,7 +136,9 @@ class EndpointHandler:
                 "format": "wav",
             }
         except Exception as err:
-            raise RuntimeError(f"{type(err).__name__}: {err}; {_payload_preview(data)}") from err
+            raise RuntimeError(
+                f"{type(err).__name__}: {err}; {_payload_preview(data)}\n{traceback.format_exc()}"
+            ) from err
 
 
 def _has_diffusers_index(path: str) -> bool: