JBulider2006 不能建com包？？？

[leo_llu]

JBulider2006+JDK5.0 建com包然后做swing界面不能切换到design模式
然而包名不叫com时就没问题
报错内容：
Invalid index processing BeanInfo class com.Untitled1BeanInfo
class sun.misc.InvalidJarIndexException Invalid index
Unable to design Untitled1.java. Make sure that the file is in the current project, does not contain any syntax errors, and that all resources are compiled.

忘告知！！！