java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at hudson.plugins.disk_usage.DiskUsageThread$DiskUsageCallable.getFileSize(DiskUsageThread.java:161)
at hudson.plugins.disk_usage.DiskUsageThread$DiskUsageCallable.getFileSize(DiskUsageThread.java:162)
at hudson.plugins.disk_usage.DiskUsageThread$DiskUsageCallable.getFileSize(DiskUsageThread.java:162)
at hudson.plugins.disk_usage.DiskUsageThread$DiskUsageCallable.getFileSize(DiskUsageThread.java:162)
at hudson.plugins.disk_usage.DiskUsageThread$DiskUsageCallable.call(DiskUsageThread.java:154)
at hudson.plugins.disk_usage.DiskUsageThread$DiskUsageCallable.call(DiskUsageThread.java:144)
at hudson.FilePath.act(FilePath.java:784)
at hudson.plugins.disk_usage.DiskUsageThread.calculateWorkspaceDiskUsage(DiskUsageThread.java:127)
at hudson.plugins.disk_usage.DiskUsageThread.execute(DiskUsageThread.java:78)
at hudson.model.AsyncPeriodicWork$1.run(AsyncPeriodicWork.java:51)
at java.lang.Thread.run(Thread.java:636)

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