Are you using the aliases as the piece IDs instead of the original piece IDs specified by the set file being used? If so, that will not work. You need to use the piece IDs originally specified by the set file, as the alias command only makes a visual change to the piece ID (it does not change the internal ID used in the code).
Are you using the aliases as the piece IDs instead of the original piece IDs specified by the set file being used? If so, that will not work. You need to use the piece IDs originally specified by the set file, as the alias command only makes a visual change to the piece ID (it does not change the internal ID used in the code).