Update app.py

app.py

@@ -4,7 +4,7 @@ from pathlib import Path
 
 
 def inference(audio):
-  os.mkdir("out",exist_ok=True)
+  os.makedirs("out", exist_ok=True)
   os.system("python3 -m demucs.separate -n demucs48_hq -d cpu " +audio.name+" -o out")
   audioname = Path(audio.name).stem
   return "./out/demucs48_hq/"+audioname+"/vocals.wav"