[JENKINS] Lucene-Solr-6.x-Linux (64bit/jdk1.8.0_102) - Build # 2125 - Failure!

[Policeman Jenkins Server <je...@thetaphi.de>]

Build: https://jenkins.thetaphi.de/job/Lucene-Solr-6.x-Linux/2125/
Java: 64bit/jdk1.8.0_102 -XX:+UseCompressedOops -XX:+UseConcMarkSweepGC

All tests passed

Build Log:
[...truncated 55796 lines...]
changes-to-html:
    [mkdir] Created dir: /home/jenkins/workspace/Lucene-Solr-6.x-Linux/lucene/build/docs/changes
      [get] Getting: https://issues.apache.org/jira/rest/api/2/project/LUCENE
      [get] To: /home/jenkins/workspace/Lucene-Solr-6.x-Linux/lucene/build/docs/changes/jiraVersionList.json
     [exec] Section 'Improvements' appears more than once under release '6.4.0' at /home/jenkins/workspace/Lucene-Solr-6.x-Linux/lucene/site/changes/changes2html.pl line 135.

BUILD FAILED
/home/jenkins/workspace/Lucene-Solr-6.x-Linux/build.xml:765: The following error occurred while executing this line:
/home/jenkins/workspace/Lucene-Solr-6.x-Linux/build.xml:101: The following error occurred while executing this line:
/home/jenkins/workspace/Lucene-Solr-6.x-Linux/lucene/build.xml:138: The following error occurred while executing this line:
/home/jenkins/workspace/Lucene-Solr-6.x-Linux/lucene/build.xml:479: The following error occurred while executing this line:
/home/jenkins/workspace/Lucene-Solr-6.x-Linux/lucene/common-build.xml:2514: exec returned: 255

Total time: 69 minutes 44 seconds
Build step 'Invoke Ant' marked build as failure
Archiving artifacts
[WARNINGS] Skipping publisher since build result is FAILURE
Recording test results
Email was triggered for: Failure - Any
Sending email for trigger: Failure - Any