Weblogic JSP compilation error

Compilation of JSP File '/ket-qua/phong_do.jsp' failed:

phong_do.jsp:486:33: Error in "/data/webhome/bongda.wap.vn/include/popup.inc.jsp" at line 1: The page directive attribute "contentType" may only be used once per JSP page.
                <%@include file="../include/footer.jsp" %>
                                ^---------------------^