四层板用powerpcb 布线时出现如下问题，不知为什么？ powerpcb, 层板

lanjingling

用powerpcb布四层板时,
在原理图和pcb板OLE时出现如下警告：，如何消除呢？

Database Integrity Test Report on file bbbb.pcb -- Thu Oct 27 10:07:45 2005

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WARNING: Non-plane layer Bottom is associated with signal GND

CORRECTION: Layer is un-associated

WARNING: Non-plane layer Bottom is associated with signal AGND

CORRECTION: Layer is un-associated

请各位大侠指教，谢谢！

[此贴子已经被作者于2005-10-27 11:26:55编辑过]