If you use Cubase 12 and are experiencing an unresolvable Error 1 when using M1 compatible Spitfire libraries, please note, Steinberg have identified an issue with Cubase 12, which currently opens by default using Rosetta, though the check box in the Get Info pane is not ticked.
This can be resolved by following the instructions in this Steinberg support article:
If you continue to receive errors using M1 compatible libraries after ensuring Cubase 12 is running natively, please do contact us using the Help widget below.