buildbot exception in on ofbizBranch18FrameworkPlugins

[buildbot]

The Buildbot has detected a build exception on builder 
ofbizBranch18FrameworkPlugins while building . Full details are available at:
    https://ci.apache.org/builders/ofbizBranch18FrameworkPlugins/builds/239

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

Buildslave for this Build: asf947_ubuntu

Build Reason: forced: by IRC user <jleroux> (privmsg): forces manual build 
after config changes
Build Source Stamp: HEAD
Blamelist: 

BUILD FAILED: exception shell_1 upload

Sincerely,
 -The Buildbot