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

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java.lang.NullPointerException	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:213)	at com.google.common.io.Files$FileByteSink.<init>(Files.java:195)	at com.google.common.io.Files$FileByteSink.<init>(Files.java:189)	at com.google.common.io.Files.asByteSink(Files.java:186)	at com.google.common.io.Files.asCharSink(Files.java:232)	at com.google.common.io.Files.write(Files.java:508)	at com.google.common.io.Files.append(Files.java:492)	at com.samsung.sec.dexter.executor.cli.CLIResultFile.writeXmlResultFilePrefix(CLIResultFile.java:47)	at com.samsung.sec.dexter.executor.cli.CLIAnalysisResultHandler.handleBeginnigOfResultFile(CLIAnalysisResultHandler.java:105)	at com.samsung.sec.dexter.executor.cli.CLIAnalysisResultHandler.handleAnalysisResult(CLIAnalysisResultHandler.java:64)	at com.samsung.sec.dexter.executor.DexterAnalyzerThread.run(DexterAnalyzerThread.java:102)	at com.samsung.sec.dexter.executor.DexterAnalyzer.runSync(DexterAnalyzer.java:79)	at com.samsung.sec.dexter.executor.cli.Main.analyzeSynchronously(Main.java:204)	at com.samsung.sec.dexter.executor.cli.Main.analyze(Main.java:129)