Looks like that xUnit plugin v1.29 doesn't work correctly when working on slave. I get the error (see below).
Looks like he tries to access a file "C:\Jenkins\userContent\xunit/BoostTest/1.x" which doesn't exist. Version 1.27 of plugin works correctly.

[xUnit] [ERROR] - Conversion error remote file operation failed: C:\Jenkins\userContent\xunit/BoostTest/1.x at hudson.remoting.Channel@1ac04e8:channel
ERROR: Publisher com.thalesgroup.hudson.plugins.xunit.XUnitPublisher aborted due to exception
hudson.util.IOException2: remote file operation failed: C:\Jenkins\workspace\Anton-test at hudson.remoting.Channel@1510a2d:telco-builder
at hudson.FilePath.act(FilePath.java:781)
at hudson.FilePath.act(FilePath.java:767)
at com.thalesgroup.hudson.plugins.xunit.XUnitPublisher.performTests(XUnitPublisher.java:164)
at com.thalesgroup.hudson.plugins.xunit.XUnitPublisher.performXUnit(XUnitPublisher.java:112)
at com.thalesgroup.hudson.plugins.xunit.XUnitPublisher.perform(XUnitPublisher.java:89)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)
at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:694)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:669)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:647)
at hudson.model.Build$RunnerImpl.post2(Build.java:162)
at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:616)
at hudson.model.Run.run(Run.java:1429)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:230)
Caused by: hudson.util.IOException2: There are some problems during the conversion into JUnit reports:
at com.thalesgroup.hudson.plugins.xunit.service.XUnitTransformer.invoke(XUnitTransformer.java:164)
at com.thalesgroup.hudson.plugins.xunit.service.XUnitTransformer.invoke(XUnitTransformer.java:37)
at hudson.FilePath$FileCallableWrapper.call(FilePath.java:2022)
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$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
Caused by: com.thalesgroup.hudson.plugins.xunit.exception.XUnitException: Conversion error remote file operation failed: C:\Jenkins\userContent\xunit/BoostTest/1.x at hudson.remoting.Channel@1ac04e8:channel
at com.thalesgroup.hudson.plugins.xunit.service.XUnitConversionService.convert(XUnitConversionService.java:93)
at com.thalesgroup.hudson.plugins.xunit.service.XUnitTransformer.invoke(XUnitTransformer.java:135)
... 11 more
Caused by: hudson.util.IOException2: remote file operation failed: C:\Jenkins\userContent\xunit/BoostTest/1.x at hudson.remoting.Channel@1ac04e8:channel
at hudson.FilePath.act(FilePath.java:781)
at hudson.FilePath.act(FilePath.java:767)
at hudson.FilePath.exists(FilePath.java:1035)
at com.thalesgroup.hudson.plugins.xunit.service.XUnitConversionService.convertInputMetricXSL(XUnitConversionService.java:112)
at com.thalesgroup.hudson.plugins.xunit.service.XUnitConversionService.convert(XUnitConversionService.java:82)
... 12 more
Caused by: java.io.IOException: Remote call on channel failed
at hudson.remoting.Channel.call(Channel.java:690)
at hudson.FilePath.act(FilePath.java:774)
... 16 more
Caused by: java.lang.NoClassDefFoundError: hudson/remoting/RemoteClassLoader$RemoteIClassLoader
at hudson.remoting.RemoteClassLoader.export(RemoteClassLoader.java:353)
at hudson.remoting.UserRequest.<init>(UserRequest.java:69)
at hudson.remoting.Channel.call(Channel.java:680)
... 17 more
Caused by: java.lang.ClassNotFoundException: hudson.remoting.RemoteClassLoader$RemoteIClassLoader
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 20 more
Finished: FAILURE