ANSYS布尔操作失败了怎么办

topological degeneracy detected for VSBV command.Try modifying geometry slightly or loosening the tolerance (BTOL command) .If BTOL is relaxed,be sure to change the tolerance back to the default after operation.
要求是把中间的杆和外面的反相器减去螺旋体，大侠帮帮忙哈