java.io.IOException: remote file operation failed: /Users/realm/workspace/objc_pr at hudson.remoting.Channel@4ec66dd4:sf_host1_3: java.io.IOException: Remote call on sf_host1_3 failed
	at hudson.FilePath.act(FilePath.java:1014)
	at hudson.FilePath.act(FilePath.java:996)
	at org.jenkinsci.plugins.gitclient.Git.getClient(Git.java:131)
	at hudson.plugins.git.GitSCM.createClient(GitSCM.java:741)
	at hudson.plugins.git.GitSCM.createClient(GitSCM.java:733)
	at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1080)
	at hudson.scm.SCM.checkout(SCM.java:485)
	at hudson.model.AbstractProject.checkout(AbstractProject.java:1269)
	at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:604)
	at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:529)
	at hudson.model.Run.execute(Run.java:1741)
	at hudson.matrix.MatrixBuild.run(MatrixBuild.java:301)
	at hudson.model.ResourceController.execute(ResourceController.java:98)
	at hudson.model.Executor.run(Executor.java:410)
Caused by: java.io.IOException: Remote call on sf_host1_3 failed
	at hudson.remoting.Channel.call(Channel.java:789)
	at hudson.FilePath.act(FilePath.java:1007)
	... 14 more
Caused by: java.lang.NoClassDefFoundError: Could not initialize class com.sun.proxy.$Proxy11
	at sun.reflect.GeneratedConstructorAccessor17.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at java.lang.reflect.Proxy.newProxyInstance(Proxy.java:739)
	at hudson.remoting.RemoteInvocationHandler.wrap(RemoteInvocationHandler.java:143)
	at hudson.remoting.Channel.export(Channel.java:621)
	at hudson.remoting.Channel.export(Channel.java:590)
	at org.jenkinsci.plugins.gitclient.LegacyCompatibleGitAPIImpl.writeReplace(LegacyCompatibleGitAPIImpl.java:201)
	at sun.reflect.GeneratedMethodAccessor35.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at java.io.ObjectStreamClass.invokeWriteReplace(ObjectStreamClass.java:1118)
	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1136)
	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
	at hudson.remoting.UserRequest._serialize(UserRequest.java:157)
	at hudson.remoting.UserRequest.serialize(UserRequest.java:166)
	at hudson.remoting.UserRequest.perform(UserRequest.java:128)
	at hudson.remoting.UserRequest.perform(UserRequest.java:48)
	at hudson.remoting.Request$2.run(Request.java:326)
	at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:68)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at hudson.remoting.Engine$1$1.run(Engine.java:62)
	at java.lang.Thread.run(Thread.java:745)
	at ......remote call to sf_host1_3(Native Method)
	at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1416)
	at hudson.remoting.UserResponse.retrieve(UserRequest.java:253)
	at hudson.remoting.Channel.call(Channel.java:781)
	... 15 more