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java.lang.NullPointerException: 	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:213)	at com.google.common.io.Files$FileByteSink.(Files.java:195)	at com.google.common.io.Files$FileByteSink.(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.writeXml2ResultFilePostfix(CLIResultFile.java:119)	at com.samsung.sec.dexter.executor.cli.CLIAnalysisResultHandler.handleEndOfResultFile(CLIAnalysisResultHandler.java:129)	at com.samsung.sec.dexter.executor.cli.CLIAnalysisResultHandler.handleAnalysisResult(CLIAnalysisResultHandler.java:95)	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:203)	at com.samsung.sec.dexter.executor.cli.Main.analyze(Main.java:129)	at com.samsung.sec.dexter.executor.cli.Main.main(Main.java:74)