我用Ant编译SUN的那个经典例子Duke 时，用命令ant compile-ejb时，出现下面错误
E:\Doc\Java\J2EE\sun\j2eetutorial14\examples\web\hello2>asant build
Buildfile&: build.xml
init:
prepare:
copy:
build:
[javac] Compiling 2 source files to E:\Doc\Java\J2EE\sun\j2eetutorial14\exam
ples\web\hello2\build
BUILD FAILED
file&:E:/Doc/Java/J2EE/sun/j2eetutorial14/examples/web/hello2/build.xml:53: E:\li
b not found.
请问是怎么回事啊？