关于格式转换的问题

<P>我是个新人，正在学习arcgis</P>
<P>在把shapefile 转换为 coverage 格式的时候，常常都会出现错误</P>
<P>details里面这样写：</P>
<P>Start Time: Mon Dec 06 12:40:24 2004
Error in executing function
Failed to execute (FeatureclassToCoverage_4).
End Time: Mon Dec 06 12:40:24 2004 </P>
<P>或者这样：</P>
<P>Start Time: Mon Dec 06 12:44:32 2004
Reading Features...
Unexpected TopoEngine Error
Failed to execute (FeatureclassToCoverage_5).
End Time: Mon Dec 06 12:44:32 2004 </P>
<P>请问这是什么问题？</P>

<P>重新设置下坐标系统和投影等</P>

<P>还有就是，在格式转换失败后，用arcmap打开 原来的 shapefile 时候</P><P>无法显示shapefile里面的东西，系统要求出现warning如下：</P><P>one or more of the added layers has an extent that si  not</P><P>consistent with the associated spatial reference information.</P><P>Reprojecting the data in such a layer may lead to unexpected</P><P>behavior. Use ArcCatalog to confirm the spatial reference is correct</P><P>and adjust if necessary.</P><P>请问这又是什么问题，如何解决？</P>