buildbot exception in on tomee-1.7.x-deploy

[buildbot]

The Buildbot has detected a build exception on builder tomee-1.7.x-deploy while 
building . Full details are available at:
    https://ci.apache.org/builders/tomee-1.7.x-deploy/builds/1569

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

Buildslave for this Build: bb_slave7_ubuntu

Build Reason: The Nightly scheduler named 'tomee-1.7.x-deploy' triggered this 
build
Build Source Stamp: [branch tomee-1.7.x] HEAD
Blamelist: 

BUILD FAILED: exception git

Sincerely,
 -The Buildbot