Heart-Rate-Detection
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TypeError: expected string or buffer

same error, anyone had a sulotion!
Looks like "ws.receive()" is returning None.
Also tried running with Flask as the server:
%python app.py
...
127.0.0.1 - - [18/Apr/2021 19:57:06] "GET /favicon.ico HTTP/1.1" 404 -
127.0.0.1 - - [18/Apr/2021 19:57:07] "GET /static/css/Hero.otf HTTP/1.1" 200 -
127.0.0.1 - - [18/Apr/2021 19:57:07] "GET /static/css/BlurMedium.otf HTTP/1.1" 200 -
127.0.0.1 - - [18/Apr/2021 19:57:08] "GET /begin HTTP/1.1" 200 -
127.0.0.1 - - [18/Apr/2021 19:57:08] "GET /static/js/main.js HTTP/1.1" 200 -
127.0.0.1 - - [18/Apr/2021 19:57:08] "GET /echo HTTP/1.1" 404 -
This repository was not maintained from long time.
HELLO, CAN YOU HELP ME WITH THIS PROJECT...