[jbosstools-builds] Build failed in Jenkins: jbosstools-docs-nightly #906

[ci-builds at redhat.com]

See <http://jenkins.mw.lab.eng.bos.redhat.com/hudson/job/jbosstools-docs-nightly/906/>

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Started by user mmurray at REDHAT.COM
[EnvInject] - Loading node environment variables.
Building remotely on rhts-stacks1
Updating https://svn.jboss.org/repos/devstudio/trunk/hudson-jobs/settings
At revision 10962
no change for https://svn.jboss.org/repos/devstudio/trunk/hudson-jobs/settings since the previous build
Checkout:jbosstools-docs-nightly / <http://jenkins.mw.lab.eng.bos.redhat.com/hudson/job/jbosstools-docs-nightly/ws/> - hudson.remoting.Channel at 36d8a785:rhts-stacks1
Using strategy: Default
Last Built Revision: Revision 979f8cf778aa94777b5323a51ce6895d7ef6e88e (origin/master)
Fetching changes from 1 remote Git repository
Fetching upstream changes from git://github.com/jbosstools/jbosstools-documentation.git
Commencing build of Revision 471e366084f7c60ba2019a462102a662be7c8b77 (origin/master)
Checking out Revision 471e366084f7c60ba2019a462102a662be7c8b77 (origin/master)
FATAL: Could not checkout null with start point 471e366084f7c60ba2019a462102a662be7c8b77
hudson.plugins.git.GitException: Could not checkout null with start point 471e366084f7c60ba2019a462102a662be7c8b77
	at hudson.plugins.git.GitAPI.checkoutBranch(GitAPI.java:872)
	at hudson.plugins.git.GitSCM$4.invoke(GitSCM.java:1284)
	at hudson.plugins.git.GitSCM$4.invoke(GitSCM.java:1268)
	at hudson.FilePath$FileCallableWrapper.call(FilePath.java:2047)
	at hudson.remoting.UserRequest.perform(UserRequest.java:118)
	at hudson.remoting.UserRequest.perform(UserRequest.java:48)
	at hudson.remoting.Request$2.run(Request.java:287)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at hudson.remoting.Engine$1$1.run(Engine.java:60)
	at java.lang.Thread.run(Thread.java:662)
Caused by: hudson.plugins.git.GitException: Command "git checkout -f 471e366084f7c60ba2019a462102a662be7c8b77" returned status code 128:
stdout: 
stderr: fatal: unable to read tree ef16918afa4d40907efcae991d034c14ae023559

	at hudson.plugins.git.GitAPI.launchCommandIn(GitAPI.java:779)
	at hudson.plugins.git.GitAPI.launchCommand(GitAPI.java:741)
	at hudson.plugins.git.GitAPI.launchCommand(GitAPI.java:751)
	at hudson.plugins.git.GitAPI.checkoutBranch(GitAPI.java:859)
	... 13 more