Here is my error:
Executing task: C:\Users\Susan.platformio\penv\Scripts\platformio.exe run --environment STM32G0B1RE_btt <
Processing STM32G0B1RE_btt (platform: ststm32@~14.1.0; board: marlin_STM32G0B1RE; framework: arduino)
Error: Unknown board ID ‘marlin_STM32G0B1RE’
The terminal process “C:\Users\Susan.platformio\penv\Scripts\platformio.exe ‘run’, ‘–environment’, ‘STM32G0B1RE_btt’” terminated with exit code: 1.
Terminal will be reused by tasks, press any key to close it.