Siwave在使用中遇到问题

flashbang

我在Siwave在使用Simulation中的compute resonant mode时出现的问题：
Simulation Status
  Simulation "Resonant Mode Sim 1" started on host PCASUS at Sat Jun 11 20:34:26 2016
  Simulation "Resonant Mode Sim 1" terminated on host PCASUS at Sat Jun 11 20:34:26 2016 with exit code 1
Pre-setup Validation Error
  SIwave analysis mandates that at least one plane be present in the geometry
请问大家是怎么解决的，急需！！！