error into feedback-examples/streamlit/main.py

[lordpba]

into the example:
feedback-examples/streamlit/main.py

I always receive error:

LangSmithAuthError: Authentication failed for /feedback. HTTPError('401 Client Error: Unauthorized for url: https://api.smith.langchain.com/feedback', '{"detail":"Invalid token"}')

(issue comes from line 110 of main.py)

Traceback:
File "/home/zeus/miniconda3/envs/cloudspace/lib/python3.10/site-packages/streamlit/runtime/scriptrunner/script_runner.py", line 541, in _run_script
exec(code, module.dict)
File "/teamspace/studios/this_studio/LS_chat_example.py", line 112, in
feedback_record = client.create_feedback(
File "/home/zeus/miniconda3/envs/cloudspace/lib/python3.10/site-packages/langsmith/client.py", line 4353, in create_feedback
raise e
File "/home/zeus/miniconda3/envs/cloudspace/lib/python3.10/site-packages/langsmith/client.py", line 4341, in create_feedback
self.request_with_retries(
File "/home/zeus/miniconda3/envs/cloudspace/lib/python3.10/site-packages/langsmith/client.py", line 757, in request_with_retries
raise ls_utils.LangSmithAuthError(

my .env for LangSmith is all correct, it works on other files, just this from this example has this issue? Why?
Thanks!