Error: Unknown environment names 'genericSTM32F103C8'. Valid names are ' genericSTM32F103C8'

the only difference is the space before generic… how to deal this problem ?

I’m guessing you wrote

[env: genericSTM32F103C8]
board = genericSTM32F103C8

then you have an environment with also a space in it, aka " genericSTM32F103C8". Remove any spaces in the environment name.

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