Update app.py

app.py

@@ -19,7 +19,7 @@ def recognize_music(pdf_file):
     output_file = output_dir + "/" + musicXml_file_name
 
     cmd = [
-        audiveris, "-batch", "-export", "-output", output_dir, pdf_file_path
+        audiveris, "-batch", "--add-opens java.base/java.nio=ALL-UNNAMED", "-export", "-output", output_dir, pdf_file_path
     ]
 
     result = subprocess.run(cmd, capture_output=True, text=True)