adams仿真中on different parts？ 80

ADAMS VIEW出现如下错误：

ERROR:   .PietteSystem.lianjie.SOLID10.shell and its reference marker, .PietteSystem._2haopidai_2.PSMAR,

          are on different parts

ERROR:   .PietteSystem.qiegeyuan.SOLID11.shell and its reference marker, .PietteSystem._2haopidai_2.PSMAR,

          are on different parts

ERROR:   .PietteSystem.zdaogui.SOLID12.shell and its reference marker, .PietteSystem._2haopidai_2.PSMAR,

          are on different parts

ERROR:   .PietteSystem.ztanzhen.SOLID13.shell and its reference marker, .PietteSystem._2haopidai_2.PSMAR,

          are on different parts

ERROR:   .PietteSystem.ydaogui.SOLID8.shell and its reference marker, .PietteSystem.____1.PSMAR,

          are on different parts

ERROR:   .PietteSystem.ydianjipidai.SOLID16.shell and its reference marker, .PietteSystem.zdianjipidai.PSMAR,

          are on different parts

请问是什么原因