Serving LCEL chains

[oyinig]

Does Langcorn support the serving of LCEL chains currently? I tried it and I got some error along the line of :

File "C:\Users\A\Documents\langcorn\langcorn-exanples\lib\site-packages\click\core.py", line 1434, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "C:\Users\A\Documents\langcorn\langcorn-exanples\lib\site-packages\click\core.py", line 783, in invoke
return _callback(*args, **kwargs)
File "C:\Users\A\Documents\langcorn\langcorn-exanples\lib\site-packages\uvicorn\main.py", line 416, in main
run(
File "C:\Users\A\Documents\langcorn\langcorn-exanples\lib\site-packages\uvicorn\main.py", line 587, in run
server.run()
File "C:\Users\A\Documents\langcorn\langcorn-exanples\lib\site-packages\uvicorn\server.py", line 61, in run
return asyncio.run(self.serve(sockets=sockets))
File "C:\Python310\lib\asyncio\runners.py", line 44, in run
return loop.run_until_complete(main)
File "C:\Python310\lib\asyncio\base_events.py", line 646, in run_until_complete
return future.result()
File "C:\Users\A\Documents\langcorn\langcorn-exanples\lib\site-packages\uvicorn\server.py", line 68, in serve
config.load()
File "C:\Users\A\Documents\langcorn\langcorn-exanples\lib\site-packages\uvicorn\config.py", line 467, in load
self.loaded_app = import_from_string(self.app)
File "C:\Users\A\Documents\langcorn\langcorn-exanples\lib\site-packages\uvicorn\importer.py", line 21, in import_from_string
module = importlib.import_module(module_str)
File "C:\Python310\lib\importlib_init.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "", line 1050, in _gcd_import
File "", line 1027, in _find_and_load
File "", line 1006, in _find_and_load_unlocked
File "", line 688, in _load_unlocked
File "", line 883, in exec_module
File "", line 241, in _call_with_frames_removed
File "C:\Users\A\Documents\langcorn\gradely\application\vercel.py", line 5, in
app:FastAPI = create_service(
File "C:\Users\A\Documents\langcorn\gradely\langcorn\server\api.py", line 139, in create_service
inn, out = derive_fields(chain)
File "C:\Users\A\Documents\langcorn\gradely\langcorn\server\api.py", line 69, in derive_fields
return [language_app.input_key], ["output"]
AttributeError: 'RunnableSequence' object has no attribute 'input_key'