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Tanmay AnwekarTanmay Anwekar 

Unknown error in <apex:barseries>

Hi Folks,
I am making a bar graph in visualforce page,

<apex:page controller="barcont">
 <apex:chart height="400" width="400" data="{!data}">
  <apex:legend position="right">
   <apex:axis type="Numeric" position="bottom" fields="data1" title="Tasks" grid="true"/>
   <apex:axis type="Numeric" position="left" fields="data2" title="user" grid="true"/>
   <apex:barSeries title="Tasks" orientation="vertical" axis="right" xField="data1" yField="data2">
    <apex:chartTips height="20" width="120"/>

It is showing error "Error: Expected at least 1 series component" , though I have mentioned all required series component. How to get out of it?