I have solved the problem:
It was caused by the board manager version
Arduino SAMD Board 1.6.21 doesn't work, I realised a downgrade to 1.6.20
I hope that this problem can be solved and can help other developers.
I have solved the problem:
It was caused by the board manager version
Arduino SAMD Board 1.6.21 doesn't work, I realised a downgrade to 1.6.20
I hope that this problem can be solved and can help other developers.