下载了jivejdon,怎么在jbuilder6下不能编译通过

flysky 02-11-12

提示如下错误:
"ContextSecurityFilter.java": Error #: 300 : class Filter not found in class com.jdon.web.control.ContextSecurityFilter at line 9, column 47
这个文件谁知道在哪儿目录, 找了半天没找到