buildbot exception in on ofbizBranch18FrameworkPlugins

[buildbot]

The Buildbot has detected a build exception on builder ofbizBranch18FrameworkPlugins while building ofbiz-plugins. Full details are available at:
    https://ci.apache.org/builders/ofbizBranch18FrameworkPlugins/builds/320

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

Buildslave for this Build: asf946_ubuntu

Build Reason: The AnyBranchScheduler scheduler named 'onBranch18PluginsCommit' triggered this build
Build Source Stamp: [branch release18.12] ba31a241ac67ae6a48e0f618d09abee81a2bad4a
Blamelist: Jacques Le Roux <[hidden email]>

BUILD FAILED: exception shell_1 upload

Sincerely,
 -The Buildbot