Backup fails with 'The process cannot access the file because another process has locked a portion of the file'

2013-08-15 18:58:00,425 WARN  [ThreadPool3 ] fisheye BackupManagerImpl$2-run - Backup failed.
java.io.IOException: The process cannot access the file because another process has locked a portion of the file

	at java.io.FileInputStream.readBytes(Native Method)

	at java.io.FileInputStream.read(FileInputStream.java:242)

	at com.cenqua.fisheye.io.IOHelper.copyStream(IOHelper.java:98)

	at com.cenqua.fisheye.io.IOHelper.copyStream(IOHelper.java:87)

	at com.atlassian.crucible.migration.item.FileSaver.add(FileSaver.java:64)

	at com.atlassian.crucible.migration.item.FileSaver.add(FileSaver.java:55)

	at com.atlassian.crucible.migration.item.FileSaver.add(FileSaver.java:55)

	at com.atlassian.crucible.migration.item.FileSaver.addPath(FileSaver.java:25)

	at com.atlassian.crucible.migration.item.FishEyeCacheBackup$SaverImpl.backup(FishEyeCacheBackup.java:104)

	at com.atlassian.crucible.migration.BackupManagerImpl.createBackup(BackupManagerImpl.java:260)

	at com.atlassian.crucible.migration.BackupManagerImpl.access$000(BackupManagerImpl.java:54)

	at com.atlassian.crucible.migration.BackupManagerImpl$2$1.perform(BackupManagerImpl.java:152)

	at com.atlassian.crucible.maintenance.MaintenanceManager.doMaintenance(MaintenanceManager.java:108)

	at com.atlassian.crucible.migration.BackupManagerImpl$2.run(BackupManagerImpl.java:150)

	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)

	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)

	at java.util.concurrent.FutureTask.run(FutureTask.java:166)

	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178)

	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292)

	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)

	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)

	at java.lang.Thread.run(Thread.java:724)