导Sub-Drawing

导Sub-Drawing时怎么也导不进来,下面是出现的问题

Clipboard Paste Session Started at Nov 28 10:13:39 2007

ROUTE KEEPIN RECTANGLE ALREADY EXISTS
Unable to paste object of type "shape" on layer ROUTE KEEPIN/ALL at (3348.11 -20
0.25)

Clipboard Paste Session Completed at Nov 28 10:13:40 2007

帮顶一下.