[JENKINS] Lucene » Solr-reference-guide-master - Build # 847 - Failure!

[Apache Jenkins Server <je...@builds.apache.org>]

Build: https://ci-builds.apache.org/job/Lucene/job/Solr-reference-guide-master/847/

Log: 
Started by an SCM change
Running as SYSTEM
[EnvInject] - Loading node environment variables.
Building remotely on websites2 (gitbox-websites git-websites svn-websites) in workspace /home/jenkins/712657a4/workspace/Lucene/Solr-reference-guide-master
The recommended git tool is: NONE
No credentials specified
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url https://gitbox.apache.org/repos/asf/lucene-solr.git # timeout=10
Cleaning workspace
 > git rev-parse --verify HEAD # timeout=10
Resetting working tree
 > git reset --hard # timeout=10
 > git clean -fdx # timeout=10
Fetching upstream changes from https://gitbox.apache.org/repos/asf/lucene-solr.git
 > git --version # timeout=10
 > git --version # 'git version 2.17.1'
 > git fetch --tags --progress -- https://gitbox.apache.org/repos/asf/lucene-solr.git +refs/heads/*:refs/remotes/origin/* # timeout=10
 > git rev-parse refs/remotes/origin/master^{commit} # timeout=10
Checking out Revision 69013d33580a525eed0ecdfefa4c82dd13268f69 (refs/remotes/origin/master)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 69013d33580a525eed0ecdfefa4c82dd13268f69 # timeout=10
Commit message: "SOLR-14762: add a readme with instructions and pointers to new repositories."
 > git rev-list --no-walk 7ada4032180b516548fc0263f42da6a7a917f92b # timeout=10
No emails were triggered.
[Gradle] - Launching build.
FATAL: The Gradle wrapper has not been found in these directories: /home/jenkins/712657a4/workspace/Lucene/Solr-reference-guide-master
Build step 'Invoke Gradle script' marked build as failure
SSH: Current build result is [FAILURE], not going to run.
Email was triggered for: Failure - Any
Sending email for trigger: Failure - Any