I have a problem that is "cannot resolve directory 'WEB-INF'" on intellij IDEA 9

Question

I created custom tag file at "/WEB-INF/tags/test.tag" and add jsp define tag

<@ taglib prefix="test" tagdir="/WEB-INF/tags/test.tag" %>

but, I have a problem that is "cannot resolve driectory 'WEB-INF'" on IntelliJ IDEA 9. This source does not have any problems on Eclipse.