buildbot exception in ASF Buildbot on corinthia-master-rat

[buildbot]

The Buildbot has detected a build exception on builder corinthia-master-rat 
while building ASF Buildbot. Full details are available at:
    http://ci.apache.org/builders/corinthia-master-rat/builds/66

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

Buildslave for this Build: silvanus_ubuntu

Build Reason: The Nightly scheduler named 'corinthia-rat-nightly' triggered 
this build
Build Source Stamp: HEAD
Blamelist: 

BUILD FAILED: exception git

Sincerely,
 -The Buildbot