service GET_ASSOCIATED_DISCUSSION_FILE can't work correctly

i want to get the comments of the content ,in fragments,the code:<!--$executeService("GET_ASSOCIATED_DISCUSSION_FILE")-->
<!--$if rsExists("discussionPosts")-->
    <!--$rsSortTree("discussionPosts", "discussionPosts!itemNumber", "discussionPosts!parentNumber",
        "dpItemNestLevel", "discussionPosts!itemNumber", "int", "asc")-->
    <!--$newDiscussion="false"-->
    <!--$loop discussionPosts-->
.........................
just as the example of Ravenna Residential   the version of ucm:  11.1.1.4.0
but it cant work at the vesion 11.1.1.5,how to deal with it ?

help！