Hi,
> When I remove the line "parallel = {'kpt'}," the error disappears.
> what did
> I do wrong?
Well, you provide a set instead of a dictionary, which is incorrect.
The use of that keyword is pretty well-documented:
https://wiki.fysik.dtu.dk/gpaw/documentation/parallel_runs/parallel_
runs.html#parallelization-options
Cheers,
Gaël