FailedConsole Output

Started by upstream project "bdg-services-prb" build number 19
originally caused by:
 GitHub pull request #5 of commit f66136384eeecef2f8c839da8c3c467acd6a5d1b automatically merged.
[EnvInject] - Loading node environment variables.
Building remotely on test02.amplab (CentOS 6.5) (test02 centos) in workspace /home/jenkins/workspace/bdg-services-prb/hadoop.version/1.0.4/label/centos
Cloning the remote Git repository
Cloning repository https://github.com/bigdatagenomics/bdg-services.git
 > git init /home/jenkins/workspace/bdg-services-prb/hadoop.version/1.0.4/label/centos # timeout=10
Fetching upstream changes from https://github.com/bigdatagenomics/bdg-services.git
 > git --version # timeout=10
 > git fetch --tags --progress https://github.com/bigdatagenomics/bdg-services.git +refs/heads/*:refs/remotes/origin/*
 > git config remote.origin.url https://github.com/bigdatagenomics/bdg-services.git # timeout=10
 > git config remote.origin.fetch +refs/heads/*:refs/remotes/origin/* # timeout=10
 > git config remote.origin.url https://github.com/bigdatagenomics/bdg-services.git # timeout=10
Fetching upstream changes from https://github.com/bigdatagenomics/bdg-services.git
 > git fetch --tags --progress https://github.com/bigdatagenomics/bdg-services.git +refs/pull/*:refs/remotes/origin/pr/*
Checking out Revision 78b42a82d0d54f687dd2a3e6206f019a8e2ebd4d (detached)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 78b42a82d0d54f687dd2a3e6206f019a8e2ebd4d
FATAL: Could not checkout null with start point 78b42a82d0d54f687dd2a3e6206f019a8e2ebd4d
hudson.plugins.git.GitException: Could not checkout null with start point 78b42a82d0d54f687dd2a3e6206f019a8e2ebd4d
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$8.execute(CliGitAPIImpl.java:1591)
	at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$1.call(RemoteGitImpl.java:153)
	at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$1.call(RemoteGitImpl.java:146)
	at hudson.remoting.UserRequest.perform(UserRequest.java:118)
	at hudson.remoting.UserRequest.perform(UserRequest.java:48)
	at hudson.remoting.Request$2.run(Request.java:328)
	at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:744)
Caused by: hudson.plugins.git.GitException: Command "git checkout -f 78b42a82d0d54f687dd2a3e6206f019a8e2ebd4d" returned status code 128:
stdout: 
stderr: fatal: reference is not a tree: 78b42a82d0d54f687dd2a3e6206f019a8e2ebd4d

	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:1407)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.access$400(CliGitAPIImpl.java:87)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$8.execute(CliGitAPIImpl.java:1586)
	... 10 more