buildbot exception in on ofbizTrunkFrameworkPlugins

[buildbot]

The Buildbot has detected a build exception on builder 
ofbizTrunkFrameworkPlugins while building . Full details are available at:
    https://ci.apache.org/builders/ofbizTrunkFrameworkPlugins/builds/1426

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

Buildslave for this Build: asf945_ubuntu

Build Reason: forced: by IRC user <jleroux> (privmsg): forces manual build to 
test steps names
Build Source Stamp: HEAD
Blamelist: 

BUILD FAILED: exception upload_4

Sincerely,
 -The Buildbot