TypeError: 'float' object is not subscriptable

[SteefW95]

I get this error when I try to start with command python3 ~/cryptoTickerGraph/main.py I've did everything what was said in the zero-btc-screen repo

I also cloned the zero-btc-screen repo and copied all the files from cryptoTickerGraph to zero-btc-screen and override everything. But same error. I think I'm doing something wrong, but what??...