buildbot failure in on ofbizBranch18Framework

[buildbot]

The Buildbot has detected a new failure on builder ofbizBranch18Framework while 
building . Full details are available at:
    https://ci.apache.org/builders/ofbizBranch18Framework/builds/148

Buildbot URL: https://ci.apache.org/

Buildslave for this Build: orcus_ubuntu

Build Reason: forced: by IRC user <jleroux> (privmsg): forces manual build to 
test gradle wrapper copy from tools
Build Source Stamp: HEAD
Blamelist: 

BUILD FAILED: failed shell_4

Sincerely,
 -The Buildbot