用gambit中的spilit命令划分一个体时出现了如下的错误提示,请问该怎么解决:<BR>Error:ACIS error 8002:misclassified graph coedge---probably geometrical prob,restoring the geometric model to the state before the current operation(if there is a possitive number of default undo levels).<BR>Undone to :volume spilit "volume.1"faces"faces.84"connetted.<BR>