buildbot exception in on syncope-master-docs

[buildbot]

The Buildbot has detected a build exception on builder syncope-master-docs 
while building . Full details are available at:
    https://ci.apache.org/builders/syncope-master-docs/builds/1

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

Buildslave for this Build: bb_slave3_ubuntu

Build Reason: forced: by IRC user <gmcdonald> on channel #asftest: test initial 
config take 2
Build Source Stamp: HEAD
Blamelist: 

BUILD FAILED: exception upload

Sincerely,
 -The Buildbot