my dev plugin version 1.614

The error below occurs intermittently, with low frequency.
but I have this zip file and can upzip it properly, I am not sure why this error pops up.
pls reply ,thx !

java.util.zip.ZipException: archive is not a ZIP archive
at org.apache.tools.zip.ZipFile.positionAtCentralDirectory(ZipFile.java:481)
at org.apache.tools.zip.ZipFile.populateFromCentralDirectory(ZipFile.java:320)
at org.apache.tools.zip.ZipFile.<init>(ZipFile.java:186)
at org.apache.tools.zip.ZipFile.<init>(ZipFile.java:163)
at org.apache.tools.zip.ZipFile.<init>(ZipFile.java:124)
at hudson.FilePath.unzip(FilePath.java:571)
at hudson.FilePath.access$300(FilePath.java:191)
at hudson.FilePath$3.invoke(FilePath.java:496)
at hudson.FilePath$3.invoke(FilePath.java:492)
at hudson.FilePath.act(FilePath.java:989)
at hudson.FilePath.act(FilePath.java:967)
at hudson.FilePath.unzip(FilePath.java:492)
at com.wangyin.ci.performance.PerformanceReporterPublisher.copyReportsToMaster(PerformanceReporterPublisher.java:742)
at com.wangyin.ci.performance.PerformanceReporterPublisher.perform(PerformanceReporterPublisher.java:334)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:761)
at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:721)
at hudson.model.Build$BuildExecution.post2(Build.java:183)
at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:670)
at hudson.model.Run.execute(Run.java:1766)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:98)
at hudson.model.Executor.run(Executor.java:374)

My code:(PerformanceReporterPublisher.copyReportsToMaster)

private void copyReportsToMaster(AbstractBuild<?, ?> build, PrintStream logger, FilePath[] listfilFilePaths, String parserDisplayName) throws IOException, InterruptedException {
FilePath remoteZipDir = null;
FilePath remoteZip = null;
try {
String zipString = "report-result.zip";
String zipDirString = "report-result";
remoteZipDir = new FilePath(build.getModuleRoot(), zipDirString);
remoteZipDir.mkdirs();
logger.println("copy remote report to remote report-result dir....");
for (FilePath src : listfilFilePaths)

{ src.copyTo(new FilePath(remoteZipDir, src.getName())); }

remoteZip = new FilePath(remoteZipDir.getParent(), zipString);
logger.println("compress remote report-result dir ....");
remoteZipDir.zip(remoteZip);
File localReport = getPerformanceReport(build, parserDisplayName, zipString);

FilePath localReportFilePath = new FilePath(localReport);
logger.println("copy report-result zip to locate....");
remoteZip.copyTo(localReportFilePath);
FilePath resultDir = new FilePath(localReportFilePath.getParent(), zipDirString);
localReportFilePath.unzip(resultDir);