You must specify the OpenROAD 12.0 development environment fully and accurately; the previous checklist should prove helpful in this regard (see Create an 11.2 Test Environment).

If possible, export a test or sample OpenROAD application, import it into your 12.0 environment, and execute it from OpenROAD Workbench to confirm that your development environment provides the appropriate permissions, connectivity, settings, and so forth, listed previously. This may save considerable effort later.