Field not found in report - jasper-reports

Question

I try to create a JasperReport's report with charts but getting error. I used table in the report and pie chart. Where I did wrong ?
I want to use same fields for reports and charts but I don't know how to use in both components.
Error:
Fields not found : campaignName
Fields not found : numTransmissions
<?xml version="1.0" encoding="UTF-8"?>
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="template_Table" pageWidth="842" pageHeight="595" orientation="Landscape" whenNoDataType="NoPages" columnWidth="802" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20">
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="One Empty Record"/>
<subDataset name="Dataset1">
<queryString>
<![CDATA[]]>
</queryString>
</subDataset>
<field name="campaignName" class="java.lang.String"/>
<field name="numTransmissions" class="java.lang.Integer"/>
<group name="Group1">
<groupExpression><![CDATA[(int)($V{REPORT_COUNT}/15)]]></groupExpression>
</group>
<group name="Group2">
<groupExpression><![CDATA[(int)($V{REPORT_COUNT}/5)]]></groupExpression>
</group>
<detail>
<band height="449" splitType="Stretch">
<componentElement>
<reportElement stretchType="RelativeToTallestObject" mode="Transparent" x="0" y="0" width="800" height="199" forecolor="#FFFFFF" backcolor="#424242">
</reportElement>
<jr:table xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd">
<datasetRun subDataset="Dataset1"/>
<jr:column width="52">
<jr:tableHeader height="70">
<staticText>
<reportElement x="0" y="0" width="52" height="70"/>
<box leftPadding="3"/>
<textElement textAlignment="Left" verticalAlignment="Middle" markup="html">
<font fontName="Verdana" size="9"/>
</textElement>
<text><![CDATA[Campaign Name]]></text>
</staticText>
</jr:tableHeader>
<jr:detailCell height="50">
<textField>
<reportElement x="0" y="0" width="52" height="50"/>
<box leftPadding="6"/>
<textElement textAlignment="Left" verticalAlignment="Middle">
<font fontName="Verdana"/>
</textElement>
<textFieldExpression><![CDATA[$F{campaignName}]]></textFieldExpression>
</textField>
</jr:detailCell>
</jr:column>
<jr:column width="53">
<jr:tableHeader height="70">
<staticText>
<reportElement x="0" y="0" width="53" height="70"/>
<box leftPadding="3"/>
<textElement textAlignment="Left" verticalAlignment="Middle" markup="html">
<font fontName="Verdana" size="9"/>
</textElement>
<text><![CDATA[Email Transmissions]]></text>
</staticText>
</jr:tableHeader>
<jr:detailCell height="50">
<textField>
<reportElement x="0" y="0" width="53" height="50"/>
<textElement textAlignment="Center" verticalAlignment="Middle"/>
<textFieldExpression><![CDATA[$F{numTransmissions}]]></textFieldExpression>
</textField>
</jr:detailCell>
</jr:column>
</jr:table>
</componentElement>
</band>
</detail>
<summary>
<band height="400" splitType="Stretch">
<pieChart>
<chart evaluationTime="Report">
<reportElement x="135" y="0" width="270" height="300"/>
<chartTitle>
<titleExpression><![CDATA["My First JR Pie Chart"]]></titleExpression>
</chartTitle>
<chartSubtitle/>
<chartLegend/>
</chart>
<pieDataset>
<keyExpression><![CDATA[$F{campaignName}]]></keyExpression>
<valueExpression><![CDATA[$F{numTransmissions}]]></valueExpression>
</pieDataset>
<piePlot>
<plot/>
<itemLabel/>
</piePlot>
</pieChart>
</band>
</summary>
</jasperReport>