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Error when generating firmware files

Hello,

I’m trying to test the OpenGrab v3 performance with the external button, but it doesn’t work. I flashed the device using the prebuilt .hex file that is provided on the repository, but after that, no response was obtained, so I thought it would be better to build the firmware from the code provided in the repository. Nevertheless, I got the error shown in the image attached, do you have any suggestion as to how to proceed?

Thanks in advance for the support!

You should use GNU/Linux for building the firmware.