Empty Ant <junitreport> report for SoapUI testrunn

I am running a SoapUI project using Ant to get a JUnit report.

Here is my build.xml:

<project basedir="." default="testreport" name="APIAutomation">
<target name="SoapUI">
    <exec dir="." executable="C:\Program Files (x86)\SmartBear\SoapUI-5.0.0\bin\testrunner.bat">
        <arg line="-r -j -a -f 'C:\Users\F3020722\Desktop\Notification\New folder' -sFirstLoginTest 'C:\Users\F3020722\Desktop\Notification\New folder\APIRegression.xml'"></arg>
    </exec>
</target>
<target name="testreport" depends="SoapUI">
    <junitreport todir="C:\Users\F3020722\Desktop\Notification\New folder\API">
        <fileset dir="C:\Users\F3020722\Desktop\Notification\New folder\API">
            <include name="TEST-*.xml"/>
        </fileset>
        <report format="frames"
            todir="C:\Users\F3020722\Desktop\Notification\New folder\reports\html">
        </report>
    </junitreport>
</target>
</project>

I am getting an XML report properly. However, the JUnit report is empty. all contains 0 and successrate is Nan.

Can anyone check the build.xml is correct?

Looks build script seems ok
Avoid spaces in the directory names
Use forward slashes like unix style even on windows
Use property file or properties in build script so that other members do not have it edit the build scripts as paths might change machine to machine.
For now, added properties in the below script, you may externalize to a property file too.

build.xml

<project basedir="." default="testreport" name="APIAutomation">
   <property name="test.suite" value="FirstLoginTest"/>
   <property name="soapui.project" value="C:/Users/F3020722/Desktop/Notification/New folder/APIRegression.xml"/>
   <property name="soapui.home" value="C:/Program Files (x86)/SmartBear/SoapUI-5.0.0"/>
   <property name="results.dir" value="C:/Users/F3020722/Desktop/Notification/API/Results"/>
   <property name="reports.dir" value="${results.dir}/Reports"/>
   <property name="html.dir" value="${reports.dir}/html"/>
   <target name="execute.project">
     <exec dir="${soapui.home}/bin" executable="testrunner.bat">
        <arg line="-raj -f ${results.dir} -s ${test.suite} ${soapui.project}" />
     </exec>
  </target>
   <target name="testreport" depends="execute.project">
        <mkdir dir="${reports.dir}"/>
            <junitreport todir="${reports.dir}">
                <fileset dir="${results.dir}">
                    <include name="TEST-*.xml"/>
                </fileset>
                <report format="frames" todir="${html.dir}" />
            </junitreport>
   </target>
</project>

You can also find a docker image for soapui and run tests & generate junit style html report as well. Refer soapui repository @ hub.docker.com

Note: that build script used docker images is exactly the same as above except the machine path.