Started by upstream project "gpkit_commons_PR_Models" build number 21
originally caused by:
 GitHub pull request #120 of commit 45c292a2c268f2f429cee2b42709e6af32a39ba1, no merge conflicts.
Building remotely on windows7x64 in workspace D:\jenkins\workspace\gpkit_commons_PR_Models\buildnode\windows7x64\optimizer\mosek
Wiping out workspace first.
Cloning the remote Git repository
Cloning repository https://github.com/convexengineering/gplibrary
 > git init D:\jenkins\workspace\gpkit_commons_PR_Models\buildnode\windows7x64\optimizer\mosek # timeout=10
Fetching upstream changes from https://github.com/convexengineering/gplibrary
 > git --version # timeout=10
 > git fetch --tags --progress https://github.com/convexengineering/gplibrary +refs/heads/*:refs/remotes/origin/*
 > git config remote.origin.url https://github.com/convexengineering/gplibrary # timeout=10
 > git config --add remote.origin.fetch +refs/heads/*:refs/remotes/origin/* # timeout=10
 > git config remote.origin.url https://github.com/convexengineering/gplibrary # timeout=10
Fetching upstream changes from https://github.com/convexengineering/gplibrary
 > git fetch --tags --progress https://github.com/convexengineering/gplibrary +refs/pull/*:refs/remotes/origin/pr/* +refs/heads/master:refs/remotes/origin/master
Merging Revision 8852b18ca88ee2b06bd293457d80b8d9b8f95657 (refs/remotes/origin/pr/120/merge) to origin/master, UserMergeOptions{mergeRemote='origin', mergeTarget='master', mergeStrategy='default', fastForwardMode='--ff'}
 > git rev-parse "origin/master^{commit}" # timeout=10
 > git config core.sparsecheckout # timeout=10
 > git checkout -f origin/master # timeout=3
 > git merge --ff 8852b18ca88ee2b06bd293457d80b8d9b8f95657 # timeout=10
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 8852b18ca88ee2b06bd293457d80b8d9b8f95657 # timeout=3
FATAL: Could not checkout 8852b18ca88ee2b06bd293457d80b8d9b8f95657
hudson.plugins.git.GitException: Command "git checkout -f 8852b18ca88ee2b06bd293457d80b8d9b8f95657" returned status code 128:
stdout: 
stderr: fatal: reference is not a tree: 8852b18ca88ee2b06bd293457d80b8d9b8f95657

	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:1924)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.access$800(CliGitAPIImpl.java:71)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$9.execute(CliGitAPIImpl.java:2214)
Also:   hudson.remoting.Channel$CallSiteStackTrace: Remote call to JNLP4-connect connection from VECTOR.MIT.EDU/18.33.0.253:60019
		at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1655)
		at hudson.remoting.UserResponse.retrieve(UserRequest.java:308)
		at hudson.remoting.Channel.call(Channel.java:904)
		at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler.execute(RemoteGitImpl.java:146)
		at sun.reflect.GeneratedMethodAccessor201.invoke(Unknown Source)
		at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
		at java.lang.reflect.Method.invoke(Method.java:498)
		at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler.invoke(RemoteGitImpl.java:132)
		at com.sun.proxy.$Proxy79.execute(Unknown Source)
		at hudson.plugins.git.extensions.impl.PreBuildMerge.decorateRevisionToBuild(PreBuildMerge.java:85)
		at hudson.plugins.git.GitSCM.determineRevisionToBuild(GitSCM.java:1023)
		at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1116)
		at hudson.scm.SCM.checkout(SCM.java:495)
		at hudson.model.AbstractProject.checkout(AbstractProject.java:1212)
		at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:566)
		at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
		at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:491)
		at hudson.model.Run.execute(Run.java:1724)
		at hudson.matrix.MatrixRun.run(MatrixRun.java:146)
		at hudson.model.ResourceController.execute(ResourceController.java:97)
		at hudson.model.Executor.run(Executor.java:421)
Caused: hudson.plugins.git.GitException: Could not checkout 8852b18ca88ee2b06bd293457d80b8d9b8f95657
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$9.execute(CliGitAPIImpl.java:2237)
	at org.jenkinsci.plugins.gitclient.RemoteGitImpl$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:153)
	at hudson.remoting.UserRequest.perform(UserRequest.java:50)
	at hudson.remoting.Request$2.run(Request.java:336)
	at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:68)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at hudson.remoting.Engine$1$1.run(Engine.java:94)
	at java.lang.Thread.run(Unknown Source)
[xUnit] [INFO] - Starting to record.
[xUnit] [INFO] - Processing JUnit
[xUnit] [INFO] - [JUnit] - No test report file(s) were found with the pattern '**/test_reports/*.xml, **/test_reports_nounits/*.xml' relative to 'D:\jenkins\workspace\gpkit_commons_PR_Models\buildnode\windows7x64\optimizer\mosek' for the testing framework 'JUnit'.  Did you enter a pattern relative to the correct directory?  Did you generate the result report(s) for 'JUnit'?
[xUnit] [ERROR] - No test reports found for the metric 'JUnit' with the resolved pattern '**/test_reports/*.xml, **/test_reports_nounits/*.xml'. Configuration error?.
[xUnit] [INFO] - Failing BUILD.
[xUnit] [INFO] - There are errors when processing test results.
[xUnit] [INFO] - Skipping tests recording.
[xUnit] [INFO] - Stop build.
[WS-CLEANUP] Deleting project workspace...[WS-CLEANUP] done
Finished: FAILURE