cad转入sde的问题

我在用arccatalog导入cad文件时出现如下错误是什么意思，“feature点太少“？？？
why?

Executing (Append): Append Polyline_Layer "Database Connections\Connection to 198.0.0.137.sde\sde.SDE.竣工图\sde.SDE.线层" TEST "Database Connections\Connection to 198.0.0.137.sde\sde.SDE.竣工图\sde.SDE.线层"
Start Time: Mon May 09 17:24:03 2005
The number of points is less than required for feature
Failed to execute (Append).

如何解决，谢谢指点