PITEST Mutation Coverage : no mutations found - maven

Question

I really wish to use PITEST for mutation coverage, but I don't know why I get this error all the time and whatever I do ( I'm using Pitest version : 1.6.7 , so I don't have to specify target tests and target classes ) :
[ERROR] Failed to execute goal org.pitest:pitest-maven:1.4.8:mutationCoverage (pitest) on project 2: Execution pitest of goal org.pitest:pitest-maven:1.4.8:mutationCoverage failed: No mutations found. This probably means there is an issue with either the supplied classpath or filters.
[ERROR] See http://pitest.org for more details.
Can you please help me with this, you can find my pom.xml below, and thank you for your answers.
<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>1</groupId>
<artifactId>2</artifactId>
<version>2</version>
<packaging>jar</packaging>
<name>2</name>
<description>Blank project for Vanilla Spring WebFlux.fn</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.0.RELEASE</version> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<start-class>2.App</start-class>
<spring-fu.version>0.0.3.BUILD-SNAPSHOT</spring-fu.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
<exclusions>
<exclusion>
<groupId>javax.annotation</groupId>
<artifactId>javax.annotation-api</artifactId>
</exclusion>
<exclusion>
<groupId>org.hibernate.validator</groupId>
<artifactId>hibernate-validator</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.fu</groupId>
<artifactId>spring-fu-jafu</artifactId>
<version>${spring-fu.version}</version>
</dependency>
<dependency>
<groupId>am.ik.yavi</groupId>
<artifactId>yavi</artifactId>
<version>0.0.18</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.pitest</groupId>
<artifactId>pitest-parent</artifactId>
<version>1.6.7</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>io.projectreactor</groupId>
<artifactId>reactor-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>cobertura-maven-plugin</artifactId>
<version>2.5.1</version>
<configuration>
<formats>
<format>html</format>
<format>xml</format>
</formats>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>3.0.0-M5</version>
</plugin>
<plugin>
<groupId>org.pitest</groupId>
<artifactId>pitest-maven</artifactId>
<version>1.6.7</version>
<configuration>
<verbose>true</verbose>
</configuration>
<executions>
<execution>
<id>pitest</id>
<phase>test</phase>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.8.2</version>
<executions>
<execution>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
<execution>
<id>report</id>
<phase>test</phase>
<goals>
<goal>report</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-snapshots</id>
<name>Spring Snapshots</name>
<url>https://repo.spring.io/snapshot</url>
<snapshots>
</snapshots>
</repository>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-snapshots</id>
<name>Spring Snapshots</name>
<url>https://repo.spring.io/snapshot</url>
<snapshots>
</snapshots>
</pluginRepository>
<pluginRepository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</pluginRepository>
</pluginRepositories>
</project>
You can find my little project (1 classe & 1 test) in my google Drive using the link below :
https://drive.google.com/file/d/1GJ7ij5zK63J2E6uOJGYWprzp-bD_OgtK/view?usp=sharing
Let me know if you succed in generating mutations and pit-reports with it, it will help me a lot ! Thank you !