maven "Failed to load Main-Class manifest attribute from"

<build>
  <plugins>
   <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <configuration>
                    <archive>
                                  <addMavenDescriptor>false</addMavenDescriptor>
                        <manifest>
                                  <mainClass>com.mycompany.app.App</mainClass>
                        </manifest>
                    </archive>

              </configuration>

</plugin>
</plugins>
</build>