请教大佬如何在VASP上算带隙小于0的金属性的介电和伯恩电荷，常规方法一直出错：
CHECK_OCCUPATIONS: ERROR, system is not insulating.
CHECK_OCCUPATIONS: ERROR, system is not insulating.
CHECK_OCCUPATIONS: ERROR, system is not insulating.
CHECK_OCCUPATIONS: ERROR, system is not insulating.
CHECK_OCCUPATIONS: ERROR, system is not insulating.
CHECK_OCCUPATIONS: ERROR, system is not insulating.
CHECK_OCCUPATIONS: ERROR, system is not insulating.
CHECK_OCCUPATIONS: ERROR, system is not insulating.
CHECK_OCCUPATIONS: ERROR, system is not insulating.
CHECK_OCCUPATIONS: ERROR, system is not insulating.
CHECK_OCCUPATIONS: ERROR, system is not insulating.
CHECK_OCCUPATIONS: ERROR, system is not insulating.
