Having problem with RowList display

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Hi, I’m new to Brightscript so I created my own view and logic for practice. I created example view with RowList but for some reason nothing display on the scene. I testing if my main scene is appear and everything working fine but RowList never display. Here is my code

Main

<interface>
        <field id="content" type="node" alias="rowlist.content"/>
    </interface>
    <children>
        <RowList
            itemComponentName="ExampleList"
            id="rowlist"
            translation="[80,350]"
            numRows="1"
            rowitemSize="[[320,180]]"
            rowItemSpacing="[[20,0]]"
            itemSize="[1100,270]"
            rowLabelOffset="[[50,20]]"
            focusXOffset="[50]"
            showRowLabel="[true]"
            rowFocusAnimationStyle="floatingfocus"
        />
    </children>

Main brs file

function init() as void
    loadFeed()
    m.rowlist = m.top.findNode("rowlist")
    m.rowlist.observeField("rowItemFocused", "onItemFocused")
end function
function loadFeed() as void
    m.contentTask = CreateObject("roSGNode", "MainLoader")
    m.contentTask.observeField("content", "onFeedResponse")
    m.contentTask.control = "RUN"
end function
function onFeedResponse() as void
    m.rowlist.content = m.contentTask.content
    m.rowlist.setFocus(true)
end function

Example List xml

<interface>
        <field id="contentData" type="node" onChange="getContentData"/>
    </interface>
    <children>
        <Poster id="ExamplePoster" width="320" height="180" loadDisplayMode="scaleToFit"/>
        <Label id="ExampleTitle" width="320" size="60" horizAlign="right"/> 
    </children>

Main Loader Task brs

function init() as void
    m.top.functionName = "LoadContent"
end function

function LoadContent() as void
    port = createObject("roMessagePort")
    getUrl = CreateObject("roURLTransfer")
    getUrl.RetainBodyOnError(true)
    getUrl.setPort(port)
    getUrl.SetUrl("https://gist.githubusercontent.com/saniyusuf/406b843afdfb9c6a86e25753fe2761f4/raw/523c324c7fcc36efab8224f9ebb7556c09b69a14/Film.JSON")
    getUrl.SetCertificatesFile("common:/certs/ca-bundle.crt")
    getUrl.InitClientCertificates()
    response = getUrl.getToString()
    json = ParseJson(response)
    if (getUrl.AsyncGetToString())
        msg = wait(10000, port)
        if (type(msg) = "roUrlEvent")
            if(msg.getresponsecode() > 0)
                if (json <> invalid)
                    row = []
                    contentNode = CreateObject("roSGNode", "ContentNode")
                    for each item in json
                        node = createObject("roSGNode", "ContentNode")
                        node.Title = item.Title
                        node.HDPOSTERURL = item.Poster
                        node.description = node.Plot
                        node.id = item.imdbID
                        contentNode.AppendChild(node)
                    end for
                    m.top.content = contentNode
                end if
            else
                ? "load failed: " msg.getfailurereason()
                ? "response code: " msg.getresponsecode()
            end if
        else if (msg = invalid)
            ? "load failed"
        end if     
    end if
end function