buildbot exception in on ofbiz-trunk-framework

[buildbot]

The Buildbot has detected a build exception on builder ofbiz-trunk-framework while building . Full details are available at:
    https://ci.apache.org/builders/ofbiz-trunk-framework/builds/924

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

Buildslave for this Build: silvanus_ubuntu

Build Reason: The AnyBranchScheduler scheduler named 'on-ofbiz-framework-commit' triggered this build
Build Source Stamp: [branch ofbiz/ofbiz-framework/trunk] 1818582
Blamelist: jleroux,mbrohl

BUILD FAILED: exception shell upload

Sincerely,
 -The Buildbot