SimpleResultsTable in HiddenPostProcess can not work

Hi,

I want to create a dashboard with 4 tables. I used a hidden search with 4 hiddenpostprocess(s). But all 4 tables can not display. When I change tables to charts, all work well. Any suggestions?

The version is 4.1.2.

Here's a simpler example pasted below - in this example i add two hiddenpostprocesses. One to generate a "single value" and one to generate a "result table". The "single value" was rendered well but the "results table" display nothing.

<view  template="dashboard.html"  stylesheet="forgroupdashboard.css">
  <label>Dashboard of PPTest</label>
  <module name="AccountBar" layoutPanel="appHeader"/>
  <module name="AppBar" layoutPanel="navigationHeader"/>
  <module name="Message" layoutPanel="messaging">
    <param name="filter">*</param>
    <param name="clearOnJobDispatch">False</param>
    <param name="maxSize">1</param> 
  </module>
  <module name="TitleBar" layoutPanel="viewHeader">
    <param name="showActionsMenu">True</param>
  </module> 

<module name="TimeRangePicker" layoutPanel="panel_row1_col1">
    <param name="selected">Last 16 days</param>
    <param name="searchWhenChanged">True</param>

    <module name="HiddenSearch" autoRun="True" layoutPanel="panel_row1_col1">
        <param name="search">eventtype="LOGIN_FAIL"</param>

        <module name="HiddenPostProcess" layoutPanel="panel_row1_col2">
            <param name="search">stats count</param>
            <module name="SingleValue">
                <param name="field">count</param>
        <param name="beforeLabel">Total failed count:</param>
        </module>
        </module>

        <module name="HiddenPostProcess" layoutPanel="panel_row2_col1">
            <param name="search">stats count as Count by UserID | sort -Count | head 20 </param>
            <module name="SimpleResultsTable">
                <param name="entityName">results</param>
                <param name="dataOverlayMode">heatmap</param>
                <param name="drilldown">all</param>
                <module name="ConvertToDrilldownSearch">
                <module name="ViewRedirector">
                    <param name="popup">True</param>
                    <param name="viewTarget">ipop_advanced_search_all</param>
                </module>
            </module>
        </module>
    </module>

</module>

</module>

</view>

Thanks,

Dianbo