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

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java.lang.NullPointerException:
at water.persist.PersistHdfs.addFolder(PersistHdfs.java:272)
at water.persist.PersistHdfs.addFolder(PersistHdfs.java:266)
at water.api.ImportHdfs.serve(ImportHdfs.java:52)
at water.api.Request.serve(Request.java:142)
at water.api.RequestServer.serve(RequestServer.java:198)
at water.NanoHTTPD$HTTPSession.run(NanoHTTPD.java:391)
at java.lang.Thread.run(Thread.java:662)

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