Don't understand Spring error?

Question

Java

I put the spring, put everything, wrote ./gradlew build,
such an error takes off

/home/rem0tec0de/Загрузки/spring-framework-5.0.0.M3/spring-context-indexer/src/main/java/org/springframework/context/index/package-info.java:21: warning: a package-info.java file has already been seen for package org.springframework.context.index
package org.springframework.context.index;
                                   ^
javadoc: warning - Multiple sources of package comments found for package "org.springframework.context.index"
javadoc: warning - Multiple sources of package comments found for package "groovy.lang"
javadoc: warning - Multiple sources of package comments found for package "org.codehaus.groovy"
javadoc: warning - Multiple sources of package comments found for package "org.codehaus.groovy.runtime"
javadoc: warning - Multiple sources of package comments found for package "org.codehaus.groovy.control"
javadoc: warning - Multiple sources of package comments found for package "javax

запускаю с параметрами --stacktrace --info --debug

21:00:30.331 [LIFECYCLE] [org.gradle.internal.buildevents.BuildResultLogger] BUILD FAILED


21:00:31.012 [INFO] [org.gradle.launcher.daemon.client.DaemonClient] Received result Failure[value=org.gradle.initialization.ReportedException: org.gradle.internal.exceptions.LocationAwareException: Execution failed for task ':referenceEpub'.] from daemon DaemonInfo{pid=15121, address=[2618e49e-37dd-4407-af08-35ee69d00810 port:42421, addresses:[/0:0:0:0:0:0:0:1%lo, /127.0.0.1]], idle=false, lastBusy=1479319142182, context=DefaultDaemonContext[uid=70b901a6-8a4c-40bd-a35f-14fe1c64b64a,javaHome=/usr/lib/jvm/java-8-openjdk-amd64,daemonRegistryDir=/root/.gradle/daemon,pid=15121,idleTimeout=10800000,daemonOpts=-XX:MaxPermSize=256m,-XX:+HeapDumpOnOutOfMemoryError,-Xmx1024m,-Dfile.encoding=UTF-8,-Duser.country=RU,-Duser.language=ru,-Duser.variant]} (build should be done).
21:00:31.012 [DEBUG] [org.gradle.launcher.daemon.client.DaemonClientConnection] thread 1: dispatching class org.gradle.launcher.daemon.protocol.Finished
21:00:31.014 [DEBUG] [org.gradle.launcher.daemon.client.DaemonClientConnection] thread 1: connection stop