EL表达式报错，求大神帮忙啊

javax.servlet.jsp.el.ELException: Exception occured while evaluating EL
at javelin.jsp.el.ExpressionEvaluatorImpl.evaluate(ExpressionEvaluatorImpl.java:113)
at jsp_servlet._yixin.__docmanager02_01._jspService(__docmanager02_01.java:132)
at weblogic.servlet.jsp.JspBase.service(JspBase.java:34)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:223)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
Truncated. see log file for complete stacktrace

<div class="cont">
    ${detail.docObj.orgName}<br><br>
    ${detail.docObj.author}<br>
    ${detail.docObj.note}<br>
    ${detail.docObj.keyCode}<br>
    ${detail.docObj.content}<br>
    ${detail.docObj.docDirName}<br><hr>
    <h3>附件</h3><br><hr>
    ${detail.fileOjb.fileName}
</div>


    只有 ${detail.fileOjb.fileName}这一句报错，其它都能正常运行，实在搞不懂了（fileOjb没有错，后台传过来的时候就是这个）