导入ECO产生的警告是怎么回事？

导入eco ,这三个网络怎么产生的，如何去掉?

** ECO In Report **

Tue Nov 24 10:05:54 2009

Input  File : E:\..\..\W880S5-091124.eco
Current Job : W880S5-091124.pcb

Line 112 , Section *END*
*END*
* *WARNING. ECO Import internal error: Invalid last Pin detected in Signal $$$1
* *WARNING. ECO Import internal error: Invalid last Pin detected in Signal $$$2
* *WARNING. ECO Import internal error: Invalid last Pin detected in Signal $$$3