Exception while trying to generate report from exec file in jacoco 0.8.10 about jacoco

[Godin]

After the clone of https://github.com/sdeleuze/spring-boot-kotlin-demo/ at commit 1d441fe508fe82e831e2ebeabefa4765edd4e803

execution of

cat <<END > build.gradle.kts
val bootRun: org.springframework.boot.gradle.tasks.run.BootRun by tasks
bootRun.apply {
    jvmArgs = listOf(
        "-javaagent:${project.projectDir.absolutePath}/jacoco-0.8.10/lib/jacocoagent.jar=output=tcpserver,port=6300"
    )
}
END

wget "https://repo1.maven.org/maven2/org/jacoco/jacoco/0.8.10/jacoco-0.8.10.zip"

unzip -d jacoco-0.8.10 jacoco-0.8.10.zip

./gradlew bootRun

and then in another terminal

java -jar jacoco-0.8.10/lib/jacococli.jar dump --port 6300 --reset --destfile test
java -jar jacoco-0.8.10/lib/jacococli.jar report test --html test.html --classfiles build/classes/kotlin/main/

produces the following output

[INFO] Connecting to localhost/127.0.0.1:6300.
[INFO] Writing execution data to /private/tmp/spring-boot-kotlin-demo/test.
[INFO] Loading execution data file /private/tmp/spring-boot-kotlin-demo/test.
[INFO] Analyzing 5 classes.

and the following report