Dear Stephen,
One way to trigger this error is if your calculation is trying to use more RAM
than is available on your machine.
An AHC calculation will need more RAM than a simple band-structure - which
could explain why one calculation ran and the other failed.
Interpolation needs matrices
Sorry, my title is incorrect. It ought to be postw90.x error. I've also
included my inputs below in the hopes that it could help someone. First I
ran a self consistent field calculation and a non self consistent field
calculation to get the wavefunctions and energies, both with spin orbit
coupling
