Update app.py

app.py

@@ -27,7 +27,7 @@ async def generate_file_structure(path='.', encoding='utf-8'):
   for entry in entries:
       entry_path = os.path.join(path, entry)
       if os.path.isdir(entry_path):
-          child_structure = generate_file_structure(entry_path, encoding)
+          child_structure =await generate_file_structure(entry_path, encoding)
           file_structure['children'].append(child_structure)
       elif os.path.isfile(entry_path):
           try: