I installed, removed and reinstalled everything but I always get:
Board m2 (platform sam, package macchina) is unknown
Error compiling for board Macchina M2.
I installed Arduino IDE 1.8.5,
https://macchina.cc/package_macchina_index.json,
Arduino SAM Boards (32-bit ARM Cortex-M3) by Arduino 1.6.11
Macchina SAM Boards (Install Arduino SAM Boards first) by Macchina 0.2.1
I choose Macchina M2 (or should it be the beta??) on COM5 (Bossa Program Port)
If I click on “Get board info” I have:
BN: Unknown board
VID: 03EB
PID: 6124
SN: Upload any sketch to obtain it
Where am I wrong?