buildbot failure in ASF Buildbot on forrest-trunk

The Buildbot has detected a new failure on builder forrest-trunk while building ASF Buildbot.
Full details are available at:
 http://ci.apache.org/builders/forrest-trunk/builds/444

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

Buildslave for this Build: portunus_ubuntu

Build Reason: scheduler
Build Source Stamp: [branch forrest/trunk] 1302536
Blamelist: 

BUILD FAILED: failed shell

sincerely,
 -The Buildbot