FailedConsole Output

Started by upstream project "mango-prb" build number 969
originally caused by:
 GitHub pull request #559 of commit fbcfc9ec5a14489ed041c4f51a15e763c6d14fa0 automatically merged.
[EnvInject] - Loading node environment variables.
Building remotely on ubuntu-testing (ubuntu ubuntu-testing-gpu) in workspace /home/jenkins/workspace/mango-prb/HADOOP_VERSION/2.7.5/SCALAVER/2.11/SPARK_VERSION/2.4.6/label/ubuntu
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url https://github.com/bigdatagenomics/mango.git # timeout=10
Fetching upstream changes from https://github.com/bigdatagenomics/mango.git
 > git --version # timeout=10
 > git fetch --tags --progress https://github.com/bigdatagenomics/mango.git +refs/pull/*:refs/remotes/origin/pr/*
Checking out Revision 7ace604a102f02ae02a068a241e81754fdef6b27 (origin/pr/559/merge)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 7ace604a102f02ae02a068a241e81754fdef6b27
FATAL: Could not checkout 7ace604a102f02ae02a068a241e81754fdef6b27
hudson.plugins.git.GitException: Could not checkout 7ace604a102f02ae02a068a241e81754fdef6b27
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$9.execute(CliGitAPIImpl.java:2185)
	at org.jenkinsci.plugins.gitclient.RemoteGitImpl$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:120)
	at hudson.remoting.UserRequest.perform(UserRequest.java:48)
	at hudson.remoting.Request$2.run(Request.java:326)
	at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:68)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
	at ......remote call to ubuntu-testing(Native Method)
	at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1416)
	at hudson.remoting.UserResponse.retrieve(UserRequest.java:220)
	at hudson.remoting.Channel.call(Channel.java:781)
	at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler.execute(RemoteGitImpl.java:146)
	at sun.reflect.GeneratedMethodAccessor612.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler.invoke(RemoteGitImpl.java:132)
	at com.sun.proxy.$Proxy63.execute(Unknown Source)
	at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1155)
	at hudson.scm.SCM.checkout(SCM.java:485)
	at hudson.model.AbstractProject.checkout(AbstractProject.java:1269)
	at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:607)
	at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:529)
	at hudson.model.Run.execute(Run.java:1738)
	at hudson.matrix.MatrixRun.run(MatrixRun.java:146)
	at hudson.model.ResourceController.execute(ResourceController.java:98)
	at hudson.model.Executor.run(Executor.java:410)
Caused by: hudson.plugins.git.GitException: Command "git checkout -f 7ace604a102f02ae02a068a241e81754fdef6b27" returned status code 128:
stdout: 
stderr: fatal: reference is not a tree: 7ace604a102f02ae02a068a241e81754fdef6b27

	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:1877)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.access$800(CliGitAPIImpl.java:71)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$9.execute(CliGitAPIImpl.java:2162)
	at org.jenkinsci.plugins.gitclient.RemoteGitImpl$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:120)
	at hudson.remoting.UserRequest.perform(UserRequest.java:48)
	at hudson.remoting.Request$2.run(Request.java:326)
	at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:68)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Finished: FAILURE