jaspersot subreport is empty - jasper-reports

Question

im trying to use subreports in jaspersoft studio but in the preview the subreport area is always empty, i tried a lot of things but no one is a solution, what am I doing wrong ?
here is my code
<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="Blank_A4" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="4eb55d03-56c6-4337-9b1b-e2f10a2d06d4">
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="New Data Adapter"/>
<style name="Style1" forecolor="#C2C2C2"/>
<parameter name="REPORT_ID" class="java.lang.Integer">
<defaultValueExpression><![CDATA[0]]></defaultValueExpression>
</parameter>
<parameter name="CREATED_AT" class="java.sql.Date"/>
<parameter name="AVERAGE_SELL_VALUE" class="java.lang.String"/>
<parameter name="MIN_SELL_VALUE" class="java.lang.String"/>
<parameter name="MAX_SELL_VALUE" class="java.lang.String"/>
<parameter name="AVERAGE_RETAKE_VALUE" class="java.lang.String"/>
<parameter name="MIN_RETAKE_VALUE" class="java.lang.String"/>
<parameter name="MAX_RETAKE_VALUE" class="java.lang.String"/>
<parameter name="BRAND" class="java.lang.String"/>
<parameter name="MODEL" class="java.lang.String"/>
<parameter name="YEAR" class="java.lang.String"/>
<parameter name="VERSION" class="java.lang.String"/>
<parameter name="KM" class="java.lang.String"/>
<parameter name="CYLINDER_CAPACITY" class="java.lang.String"/>
<parameter name="FUEL_TYPE" class="java.lang.String"/>
<parameter name="TRANSMISION" class="java.lang.String"/>
<parameter name="TRACTION" class="java.lang.String"/>
<parameter name="COLOR" class="java.lang.String"/>
<parameter name="PRICE_ADJUST" class="java.lang.String"/>
<parameter name="KM_ADJUST" class="java.lang.String"/>
<parameter name="AVERAGE_VALUE" class="java.lang.String"/>
<queryString language="JSON">
<![CDATA[report_url]]>
</queryString>
<background>
<band splitType="Stretch"/>
</background>
<pageHeader>
<band height="73" splitType="Stretch">
<textField>
<reportElement x="475" y="5" width="135" height="30" forecolor="#888888" uuid="e2639b23-eddb-4d9a-a25e-f0f153aa991b"/>
<textFieldExpression><![CDATA[$P{REPORT_ID}]]></textFieldExpression>
</textField>
<image>
<reportElement x="5" y="5" width="110" height="40" uuid="e2cc72cc-5ada-47c0-a442-74b0bdc14af6"/>
<imageExpression><![CDATA["/home/jaimo/Descargas/Group 1.svg"]]></imageExpression>
</image>
<line>
<reportElement x="125" y="23" width="1" height="15" forecolor="#888888" uuid="0bfa9970-6235-4cad-b1e3-16ca2899131c">
<property name="com.jaspersoft.studio.unit.x" value="px"/>
<property name="com.jaspersoft.studio.unit.width" value="px"/>
<property name="com.jaspersoft.studio.unit.height" value="px"/>
</reportElement>
</line>
<textField>
<reportElement x="475" y="20" width="101" height="30" forecolor="#888888" uuid="45a9e1de-56fa-49eb-95e2-85c2c1c06dc1">
<property name="com.jaspersoft.studio.unit.y" value="px"/>
</reportElement>
<textElement>
<font size="11"/>
</textElement>
<textFieldExpression><![CDATA[$P{CREATED_AT}]]></textFieldExpression>
</textField>
<staticText>
<reportElement x="135" y="15" width="178" height="30" forecolor="#888888" uuid="9ce24531-f175-4d0d-9759-e9535850818d"/>
<textElement verticalAlignment="Middle">
<font size="12"/>
</textElement>
<text><![CDATA[Informe de tasación]]></text>
</staticText>
<staticText>
<reportElement x="316" y="5" width="141" height="30" forecolor="#14344A" uuid="a6e2f389-858b-448a-844f-ed88681760fe"/>
<textElement textAlignment="Right">
<font size="12" isBold="true"/>
</textElement>
<text><![CDATA[Id Informe:]]></text>
</staticText>
<staticText>
<reportElement x="315" y="20" width="141" height="30" forecolor="#14344A" uuid="a62ca2cd-33e9-47d2-885f-b9fede598ff4">
<property name="com.jaspersoft.studio.unit.y" value="px"/>
</reportElement>
<textElement textAlignment="Right">
<font size="12" isBold="true"/>
</textElement>
<text><![CDATA[fecha de emisión:]]></text>
</staticText>
</band>
</pageHeader>
<columnHeader>
<band height="580">
<rectangle radius="10">
<reportElement x="5" y="55" width="260" height="340" forecolor="#5F6C75" uuid="a58c5d5c-b271-47e4-aa61-8c08a244322b"/>
</rectangle>
<rectangle radius="10">
<reportElement x="286" y="55" width="272" height="160" uuid="170a4d89-8ed9-491f-b862-1b9c708e651f"/>
</rectangle>
<rectangle radius="10">
<reportElement x="286" y="235" width="272" height="160" uuid="d1b5568e-f4be-4cfa-a8cc-6d761b69cbaf"/>
</rectangle>
<textField>
<reportElement x="308" y="125" width="149" height="40" forecolor="#373737" uuid="90c5e1eb-1aa2-49bd-a8f7-574d7a11d694"/>
<textElement verticalAlignment="Middle">
<font size="24" isBold="true"/>
</textElement>
<textFieldExpression><![CDATA["$" +$P{AVERAGE_SELL_VALUE}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="308" y="165" width="219" height="30" forecolor="#5F6C75" uuid="d9a02936-a161-4e50-81dd-bf1e84db717a">
<property name="com.jaspersoft.studio.unit.y" value="px"/>
</reportElement>
<textElement>
<font size="12"/>
</textElement>
<textFieldExpression><![CDATA["Rango: $" + $P{MIN_SELL_VALUE} + " / $" + $P{MAX_SELL_VALUE}]]></textFieldExpression>
</textField>
<staticText>
<reportElement x="25" y="65" width="100" height="30" forecolor="#373737" uuid="45ac0bb9-dfa0-43d0-a28f-0f08225492f6"/>
<textElement verticalAlignment="Middle">
<font size="12" isBold="true"/>
</textElement>
<text><![CDATA[Marca:]]></text>
</staticText>
<staticText>
<reportElement x="24" y="95" width="100" height="30" forecolor="#373737" uuid="0f81a7ce-35c7-4cf5-b46f-ce01e2e61cc7"/>
<textElement verticalAlignment="Middle">
<font size="12" isBold="true"/>
</textElement>
<text><![CDATA[Modelo:]]></text>
</staticText>
<staticText>
<reportElement x="24" y="125" width="100" height="30" forecolor="#373737" uuid="a84b857a-04af-492a-9140-7f734b4b341b"/>
<textElement verticalAlignment="Middle">
<font size="12" isBold="true"/>
</textElement>
<text><![CDATA[Año:]]></text>
</staticText>
<staticText>
<reportElement x="24" y="155" width="100" height="30" forecolor="#373737" uuid="1498a093-14cc-4dfd-9590-d805b492ed95"/>
<textElement verticalAlignment="Middle">
<font size="12" isBold="true"/>
</textElement>
<text><![CDATA[Versión:]]></text>
</staticText>
<staticText>
<reportElement x="24" y="185" width="100" height="30" forecolor="#373737" uuid="96a49dab-037c-44bf-8447-e1789ecc4c0a"/>
<textElement verticalAlignment="Middle">
<font size="12" isBold="true"/>
</textElement>
<text><![CDATA[KM:]]></text>
</staticText>
<staticText>
<reportElement x="24" y="215" width="100" height="30" forecolor="#373737" uuid="0e5d5220-2bcc-4c6a-9ab2-35e1b0599a2b"/>
<textElement verticalAlignment="Middle">
<font size="12" isBold="true"/>
</textElement>
<text><![CDATA[Cilindrada:]]></text>
</staticText>
<staticText>
<reportElement x="24" y="245" width="100" height="30" forecolor="#373737" uuid="33ac256b-af52-4f8b-ad65-10db6f634839"/>
<textElement verticalAlignment="Middle">
<font size="12" isBold="true"/>
</textElement>
<text><![CDATA[Combustible:]]></text>
</staticText>
<staticText>
<reportElement x="24" y="275" width="100" height="30" forecolor="#373737" uuid="a2ce1334-6202-4377-89dd-b1e0baae6260"/>
<textElement verticalAlignment="Middle">
<font size="12" isBold="true"/>
</textElement>
<text><![CDATA[Transmisión:]]></text>
</staticText>
<staticText>
<reportElement x="24" y="305" width="100" height="30" forecolor="#373737" uuid="b696d922-ba43-4567-869c-de9cb3c6c9a4"/>
<textElement verticalAlignment="Middle">
<font size="12" isBold="true"/>
</textElement>
<text><![CDATA[Tracción:]]></text>
</staticText>
<staticText>
<reportElement x="24" y="335" width="100" height="30" forecolor="#373737" uuid="a49c4cce-9f76-4360-ac4b-dcab33467bca"/>
<textElement verticalAlignment="Middle">
<font size="12" isBold="true"/>
</textElement>
<text><![CDATA[Color:]]></text>
</staticText>
<textField>
<reportElement x="124" y="66" width="130" height="30" forecolor="#5F6C75" uuid="eb22f28d-68cc-47ce-a208-8bcae9792fa9"/>
<textElement verticalAlignment="Middle">
<font size="12"/>
</textElement>
<textFieldExpression><![CDATA[$P{BRAND}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="124" y="95" width="130" height="30" forecolor="#5F6C75" uuid="b4480708-0492-49ee-8ff3-d5789b5dbaa8"/>
<textElement verticalAlignment="Middle">
<font size="12"/>
</textElement>
<textFieldExpression><![CDATA[$P{MODEL}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="124" y="125" width="130" height="30" forecolor="#5F6C75" uuid="cf88497c-1d1a-4ea2-8bdd-e6e2209c60b9"/>
<textElement verticalAlignment="Middle">
<font size="12"/>
</textElement>
<textFieldExpression><![CDATA[$P{YEAR}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="124" y="155" width="130" height="30" forecolor="#5F6C75" uuid="1a88da33-0b39-40de-a348-ca95b83a56c3"/>
<textElement verticalAlignment="Middle">
<font size="12"/>
</textElement>
<textFieldExpression><![CDATA[$P{VERSION}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="124" y="185" width="130" height="30" forecolor="#5F6C75" uuid="688eace4-c2fe-4259-88a9-7d7e1af8d04c"/>
<textElement verticalAlignment="Middle">
<font size="12"/>
</textElement>
<textFieldExpression><![CDATA[$P{KM} + "(*)"]]></textFieldExpression>
</textField>
<textField>
<reportElement x="125" y="215" width="129" height="30" forecolor="#5F6C75" uuid="7249875a-c675-4d38-b4aa-c20fd1d5eaaa"/>
<textElement verticalAlignment="Middle">
<font size="12"/>
</textElement>
<textFieldExpression><![CDATA[$P{CYLINDER_CAPACITY}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="124" y="245" width="130" height="30" forecolor="#5F6C75" uuid="33531f34-34c8-4f2b-92f3-f5ba68111cae"/>
<textElement verticalAlignment="Middle">
<font size="12"/>
</textElement>
<textFieldExpression><![CDATA[$P{FUEL_TYPE}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="124" y="275" width="130" height="30" forecolor="#5F6C75" uuid="36733743-1493-4817-bccc-89354c405821"/>
<textElement verticalAlignment="Middle">
<font size="12"/>
</textElement>
<textFieldExpression><![CDATA[$P{TRANSMISION}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="124" y="305" width="130" height="30" forecolor="#5F6C75" uuid="d484ecbc-e947-44e6-9a51-55f985f6663c"/>
<textElement verticalAlignment="Middle">
<font size="12"/>
</textElement>
<textFieldExpression><![CDATA[$P{TRACTION}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="124" y="335" width="130" height="30" forecolor="#5F6C75" uuid="80aa9276-a814-484a-8604-dc0a6057aab8"/>
<textElement verticalAlignment="Middle">
<font size="12"/>
</textElement>
<textFieldExpression><![CDATA[$P{COLOR}]]></textFieldExpression>
</textField>
<staticText>
<reportElement x="25" y="360" width="230" height="30" forecolor="#5F6C75" uuid="3e0ddb85-12f4-4398-b318-eb6aedf1cc7f">
<property name="com.jaspersoft.studio.unit.y" value="px"/>
</reportElement>
<textElement verticalAlignment="Middle">
<font size="12"/>
</textElement>
<text><![CDATA[(*) Promedio de km según antigüedad del vehiculo]]></text>
</staticText>
<staticText>
<reportElement x="305" y="245" width="240" height="20" forecolor="#14344A" uuid="fbddbb33-251d-4cbb-94c3-e324504b44a5"/>
<textElement verticalAlignment="Middle">
<font size="11" isBold="true"/>
</textElement>
<text><![CDATA[Valor en recepción en parte de pago]]></text>
</staticText>
<staticText>
<reportElement x="305" y="265" width="240" height="40" forecolor="#888888" uuid="775a79e7-7d53-44d4-a885-d66f25181fa0"/>
<textElement verticalAlignment="Middle"/>
<text><![CDATA[Precio promedio, máximo y mínimo al entregar el vehículo como parte de pago de otro vehículo.]]></text>
</staticText>
<staticText>
<reportElement x="308" y="65" width="237" height="30" forecolor="#14344A" uuid="efdf8857-7032-482d-8c46-bd2768ae1120"/>
<textElement verticalAlignment="Middle">
<font size="11" isBold="true"/>
</textElement>
<text><![CDATA[Valor estimado de venta]]></text>
</staticText>
<textField>
<reportElement x="305" y="305" width="222" height="40" forecolor="#373737" uuid="da02e43b-7bea-42ca-9885-739414847863"/>
<textElement verticalAlignment="Middle">
<font size="24" isBold="true"/>
</textElement>
<textFieldExpression><![CDATA["$" +$P{AVERAGE_RETAKE_VALUE}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="305" y="345" width="219" height="30" forecolor="#5F6C75" uuid="07c566a7-bd8c-46d2-b1b8-6ad1839ddfa7">
<property name="com.jaspersoft.studio.unit.y" value="px"/>
</reportElement>
<textElement>
<font size="12"/>
</textElement>
<textFieldExpression><![CDATA["Rango: $" + $P{MIN_RETAKE_VALUE} + " / $" + $P{MAX_RETAKE_VALUE}]]></textFieldExpression>
</textField>
<staticText>
<reportElement x="306" y="85" width="240" height="40" forecolor="#888888" uuid="4b05c58f-9941-4649-9b0d-98facaae4260"/>
<textElement textAlignment="Left" verticalAlignment="Middle"/>
<text><![CDATA[Precio promedio, máximo y mínimo de venta del vehículo.]]></text>
</staticText>
<image>
<reportElement x="15" y="10" width="30" height="30" uuid="f82c5f90-dada-4f88-a2c2-849bbc925556"/>
<imageExpression><![CDATA["/home/jaimo/Descargas/jasper_icons/single_car_icon.svg"]]></imageExpression>
</image>
<staticText>
<reportElement x="56" y="5" width="199" height="40" forecolor="#14344A" uuid="87f30195-0739-4c08-a782-6cf92a464de7"/>
<textElement verticalAlignment="Middle">
<font size="18"/>
</textElement>
<text><![CDATA[Datos del vehículo]]></text>
</staticText>
<subreport>
<reportElement x="0" y="430" width="558" height="120" uuid="7b860fe8-8737-46c2-8fc5-9747720f3abd"/>
<connectionExpression><![CDATA[$P{REPORT_CONNECTION}]]></connectionExpression>
<subreportExpression><![CDATA["subreport.jasper"]]></subreportExpression>
</subreport>
</band>
</columnHeader>
<pageFooter>
<band height="121" splitType="Stretch">
<image>
<reportElement x="-20" y="0" width="450" height="121" uuid="618a75d4-e981-47c5-b316-266e3b91666c"/>
<imageExpression><![CDATA["/home/jaimo/Descargas/miscelaneas.svg"]]></imageExpression>
</image>
<textField>
<reportElement x="470" y="45" width="100" height="30" uuid="b9eeb12e-542b-4da0-a6ce-64e071382a81"/>
<textFieldExpression><![CDATA[$V{PAGE_NUMBER}]]></textFieldExpression>
</textField>
</band>
</pageFooter>
</jasperReport>
and here is subreport expression
<subreport>
<reportElement x="0" y="430" width="558" height="120" uuid="7b860fe8-8737-46c2-8fc5-9747720f3abd"/>
<connectionExpression><![CDATA[$P{REPORT_CONNECTION}]]></connectionExpression>
<subreportExpression><![CDATA["subreport.jasper"]]></subreportExpression>
</subreport>