Missing assertion for type [JsonPath Match] error for a Soap UI project CI run - maven

Question

I have configured a CI run for a Soap UI project using Jenkins and Maven. My test steps have Json Path match assertions. Every time it runs, I get errors as
17:46:17,058 ERROR [TestAssertionRegistry] Missing assertion for type [JsonPath Match]
17:46:17,058 ERROR [TestAssertionRegistry] Missing assertion for type [JsonPath Match]
Due to the above reason, it skips all the JsonPath assertions associated with a test case step (though assertions like Valid HTTPS are validated successfully).
I am using soapui-maven-plugin:5.1.2 currently. After doing some research over internet, I found if a project is created in a version higher than the version the CI is using, the issue will persist. They recommended to re-write the project with the same version as the system, as explained at SoapUI Testrunner giving error about TestAssertionRegistry . I did but nothing changed.
I have tried soapui-maven-plugin:5.2.1 version but that didn't help either to solve the issue, instead it gave me another error and the build fails
EROR [SoapUI] An error occurred [The plugin 'C:\Users\xyz\.soapuios\plugins\SoapUI-Framework -v1.0.jar' has unsigned class files.
Please help me to fix the issue as the CI would be useless without assertions.
My pom file contains
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>soapTest</groupId>
<artifactId>soapTest</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>Maven 2 SoapUI Sample</name>
<url>http://maven.apache.org</url>
<pluginRepositories>
<pluginRepository>
<id>SmartBearPluginRepository</id>
<url>http://www.soapui.org/repository/maven2/</url>
</pluginRepository>
</pluginRepositories>
<build>
<plugins>
<plugin>
<groupId>com.smartbear.soapui</groupId>
<artifactId>soapui-maven-plugin</artifactId>
<version>5.1.2</version>
<configuration>
<projectFile>C:\Users\xyz\.jenkins\workspace\Soap-uiTest\Test.xml</projectFile>
<outputFolder>${basedir}/target/surefire-reports</outputFolder>
<junitReport>true</junitReport>
<exportAll>true</exportAll>
<printReport>true</printReport>
<testFailIgnore>true</testFailIgnore>
<!--testSuite>Negative test cases - JSON</testSuite-->
</configuration>
<executions>
<execution>
<phase>test</phase>
<goals>
<goal>test</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<!-- Extended Maven antrun plugin -->
<!-- https://maven-antrun-extended-plugin.dev.java.net/ -->
<groupId>org.jvnet.maven-antrun-extended-plugin</groupId>
<artifactId>maven-antrun-extended-plugin</artifactId>
<executions>
<execution>
<id>test-reports</id>
<phase>test</phase>
<configuration>
<tasks>
<junitreport todir="target/surefire-reports">
<fileset dir="target/surefire-reports">
<include name="**/*.xml"/>
</fileset>
<report format="noframes" todir="target/surefire-reports"/>
</junitreport>
</tasks>
</configuration>
<goals>
<goal>run</goal>
</goals>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>org.apache.ant</groupId>
<artifactId>ant-junit</artifactId>
<version>1.8.0</version>
</dependency>
<dependency>
<groupId>org.apache.ant</groupId>
<artifactId>ant-trax</artifactId>
<version>1.8.0</version>
</dependency>
</dependencies>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.19.1</version>
<configuration>
<testFailureIgnore>true</testFailureIgnore>
</configuration>
</plugin>
</plugins>
</build>
<reporting>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-report-plugin</artifactId>
<version>2.19.1</version>
</plugin>
</plugins>
</reporting>
</project>