buildbot exception in on openoffice-linux64-nightly

[buildbot]

The Buildbot has detected a build exception on builder 
openoffice-linux64-nightly while building . Full details are available at:
    https://ci.apache.org/builders/openoffice-linux64-nightly/builds/571

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

Buildslave for this Build: bb_slave8_ubuntu

Build Reason: forced: by IRC user <mseidel> (privmsg): None
Build Source Stamp: HEAD
Blamelist: 

BUILD FAILED: exception delete old build

Sincerely,
 -The Buildbot