Update app.py

app.py

@@ -321,7 +321,7 @@ def generate_video():
                 user_voice = '/home/user/app/images/Recording.m4a'
     
                 with tempfile.NamedTemporaryFile(suffix=".wav", prefix="user_voice_",dir=TEMP_DIR.name, delete=False) as temp_file:
-                    with open(user_voice_path, 'rb') as source_file:
+                    with open(user_voice, 'rb') as source_file:
                         file_contents = source_file.read()
                         temp_file.write(file_contents)